Idioms

    bring to light, to discover or reveal: The excavations brought to light the remnants of an ancient civilization.
    come to light, to be discovered or revealed: Some previously undiscovered letters have lately come to light.
    hide one's light under a bushel, to conceal or suppress one's talents or successes.
    in a good/bad light, under favorable (or unfavorable) circumstances: She worshiped him, but then she'd only seen him in a good light.
    in (the) light of, taking into account; because of; considering: It was necessary to review the decision in the light of recent developments.
    light at the end of the tunnel, a prospect of success, relief, or redemption: We haven't solved the problem yet, but we're beginning to see light at the end of the tunnel.
    see the light,
    1. to come into existence or being.
    2. to be made public.
    3. to begin to accept or understand a point of view one formerly opposed: Her father was opposed to her attending an out-of-town college, but he finally saw the light.
    shed/throw light on, to clarify; clear up: His deathbed confession threw light on a mystery of long standing.

Origin of light

1
before 900; (noun and adj.) Middle English; Old English lēoht; cognate with Old Saxon lioht, Old Frisian liacht, Dutch, German licht, Gothic liuhath (noun); akin to Old Norse ljōs (noun), ljōss (adj.), Latin lūx (noun), Greek leukós bright, white; (v.) Middle English lighten, Old English līhtan, cognate with Old Saxon liuhtian, Old High German liuhten (German leuchten), Gothic liuhtjan
Related formslight·ful, adjectivelight·ful·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for light up

light up

verb (adverb)

to light a cigarette, pipe, etc
to illuminate or cause to illuminate
to make or become cheerful or animated

Light

noun

God regarded as a source of illuminating grace and strength
Quakerism short for Inner Light

light

1

noun

the medium of illumination that makes sight possible
Also called: visible radiation electromagnetic radiation that is capable of causing a visual sensation and has wavelengths from about 380 to about 780 nanometres
(not in technical usage) electromagnetic radiation that has a wavelength outside this range, esp ultraviolet radiationultraviolet light
the sensation experienced when electromagnetic radiation within the visible spectrum falls on the retina of the eyeRelated prefix: photo-
anything that illuminates, such as a lamp or candle
a particular quality or type of lighta good light for reading
  1. illumination from the sun during the day; daylight
  2. the time this appears; daybreak; dawn
anything that allows the entrance of light, such as a window or compartment of a window
the condition of being visible or known (esp in the phrases bring or come to light)
an aspect or viewhe saw it in a different light
mental understanding or spiritual insight
a person considered to be an authority or leader
brightness of countenance, esp a sparkle in the eyes
  1. the act of igniting or kindling something, such as a cigarette
  2. something that ignites or kindles, esp in a specified manner, such as a spark or flame
  3. something used for igniting or kindling, such as a match
  1. the effect of illumination on objects or scenes, as created in a picture
  2. an area of brightness in a picture, as opposed to shade
a poetic or archaic word for eyesight
the answer to a clue in a crossword
in light of or in the light of in view of; taking into account; considering
light at the end of the tunnel hope for the ending of a difficult or unpleasant situation
out like a light quickly asleep or unconscious
see the light
  1. to gain sudden insight into or understanding of something
  2. to experience a religious conversion
see the light or see the light of day
  1. to come into being
  2. to come to public notice
shed light on or throw light on to clarify or supply additional information on
stand in a person's light to stand so as to obscure a person's vision
strike a light
  1. (verb)to ignite something, esp a match, by friction
  2. (interjection) Britishan exclamation of surprise

adjective

full of light; well-lighted
(of a colour) reflecting or transmitting a large amount of lightlight yellow Compare medium (def. 2), dark (def. 2)
phonetics relating to or denoting an (l) pronounced with front vowel resonance; clearthe French "l" is much lighter than that of English See dark (def. 9)

verb lights, lighting, lighted or lit (lɪt)

to ignite or cause to ignite
(often foll by up) to illuminate or cause to illuminate
to make or become cheerful or animated
(tr) to guide or lead by light
See also lights 1, light up
Derived Formslightish, adjectivelightless, adjective

Word Origin for light

Old English lēoht; related to Old High German lioht, Gothic liuhath, Latin lux

light

2

adjective

not heavy; weighing relatively little
having relatively low densitymagnesium is a light metal
lacking sufficient weight; not agreeing with standard or official weights
not great in degree, intensity, or numberlight rain; a light eater
without burdens, difficulties, or problems; easily borne or donea light heart; light work
graceful, agile, or deftlight fingers
not bulky or clumsy
not serious or profound; entertaininglight verse
without importance or consequence; insignificantno light matter
frivolous or capricious
loose in morals
dizzy or uncleara light head
(of bread, cake, etc) spongy or well leavened
easily digesteda light meal
relatively low in alcoholic contenta light wine
(of a soil) having a crumbly texture
(of a vessel, lorry, etc)
  1. designed to carry light loads
  2. not loaded
carrying light arms or equipmentlight infantry
(of an industry) engaged in the production of small consumer goods using light machineryCompare heavy (def. 10)
aeronautics (of an aircraft) having a maximum take-off weight less than 5670 kilograms (12 500 pounds)
chem (of an oil fraction obtained from coal tar) having a boiling range between about 100° and 210°C
(of a railway) having a narrow gauge, or in some cases a standard gauge with speed or load restrictions not applied to a main line
bridge
  1. (of a bid) made on insufficient values
  2. (of a player) having failed to take sufficient tricks to make his contract
phonetics prosody (of a syllable, vowel, etc) unaccented or weakly stressed; shortCompare heavy (def. 13) See also light 1 (def. 30)
phonetics the least of three levels of stress in an utterance, in such languages as English
light on informal lacking a sufficient quantity of (something)
make light of to treat as insignificant or trifling

adverb

a less common word for lightly
with little equipment, baggage, etcto travel light

verb lights, lighting, lighted or lit (lɪt) (intr)

(esp of birds) to settle or land after flight
to get down from a horse, vehicle, etc
(foll by on or upon) to come upon unexpectedly
to strike or fall onthe choice lighted on me
Derived Formslightish, adjectivelightly, adverblightness, noun

Word Origin for light

Old English lēoht; related to Dutch licht, Gothic leihts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for light up

light

v.2

"to illuminate, fill with brightness," Old English lyhtan, common Germanic (cf. Old Saxon liohtian, Old High German liuhtan, German leuchten, Gothic liuhtjan "to light"), from source of from light (n.). Related: Lighted; lighting.

light

adj.2

"not dark," Old English leoht, common Germanic (cf. Old Saxon and Old High German lioht, Old Frisian liacht, German licht "bright," from the source of Old English leoht (see light (n.)). Meaning "pale-hued" is from 1540s.

light

n.

"brightness, radiant energy," Old English leht, earlier leoht "light, daylight; luminous, beautiful," from West Germanic *leukhtam (cf. Old Saxon lioht, Old Frisian liacht, Middle Dutch lucht, Dutch licht, Old High German lioht, German Licht, Gothic liuhaþ "light"), from PIE *leuk- "light, brightness" (cf. Sanskrit rocate "shines;" Armenian lois "light," lusin "moon;" Greek leukos "bright, shining, white;" Latin lucere "to shine," lux "light," lucidus "clear;" Old Church Slavonic luci "light;" Lithuanian laukas "pale;" Welsh llug "gleam, glimmer;" Old Irish loche "lightning," luchair "brightness;" Hittite lukezi "is bright").

The -gh- was an Anglo-French scribal attempt to render the Germanic hard -h- sound, which has since disappeared from this word. The figurative spiritual sense was in Old English; the sense of "mental illumination" is first recorded mid-15c. Meaning "something used for igniting" is from 1680s. Meaning "a consideration which puts something in a certain view (e.g. in light of) is from 1680s. Something that's a joy and a delight has been the light of (someone's) eyes since Old English:

Ðu eart dohtor min, minra eagna leoht [Juliana].

To see the light "come into the world" is from 1680s; later in a Christian sense.

light

adj.1

"not heavy," from Old English leoht "not heavy, light in weight; easy, trifling; quick, agile," from Proto-Germanic *lingkhtaz (cf. Old Norse lettr, Swedish lätt, Old Frisian, Middle Dutch licht, German leicht, Gothic leihts), from PIE root *legwh- "not heavy, having little weight" (cf. Latin levis "light," Old Irish lu "small;" see lever).

The notion in make light of (1520s) is of "unimportance." Alternative spelling lite, the darling of advertisers, is first recorded 1962. The adverb is Old English leohte, from the adjective. Light-skirts "woman of easy virtue" is attested from 1590s. To make light of is from 1520s.

light

v.1

"touch down," from Old English lihtan "to alight; alleviate, leave," from Proto-Germanic *linkhtijan, literally "to make light," from *lingkhtaz "not heavy" (see light (adj.1)). Apparently the ground sense is "to dismount a horse, etc., and thus relieve it of one's weight." To light out "leave hastily" is 1870, from a nautical meaning "move out, move heavy objects," of unknown origin but perhaps belonging to this word (cf. lighter (n.1)).

Online Etymology Dictionary, © 2010 Douglas Harper

light up in Medicine

light

[līt]

n.

Electromagnetic radiation that has a wavelength in the range from about 4,000 (violet) to about 7,700 (red) angstroms and may be perceived by the normal unaided human eye.
Electromagnetic radiation of any wavelength.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

light up in Science

light

[līt]

Electromagnetic radiation that can be perceived by the human eye. It is made up of electromagnetic waves with wavelengths between 4 X 10-7 and 7 X 10-7 meters. Light, and all other electromagnetic radiation, travels at a speed of about 299,728 km (185,831 mi) per second in a vacuum. See also photon.
Electromagnetic energy of a wavelength just outside the range the human eye can detect, such as infrared light and ultraviolet light. See Note at electromagnetic radiation.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

light up in Culture

light

The type of electromagnetic wave that is visible to the human eye. Visible light runs along a spectrum from the short wavelengths of violet to the longer wavelengths of red. (See photon.)

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with light up

light up

1

Become or cause to become more animated or cheerful, as in Her laughter lit up the whole room, or His face lit up when he saw her. This expression transfers physical illumination to human moods. Also see lighten up. [Mid-1700s]

2

Start smoking a cigar, cigarette, or pipe, as in The minute he got outside the church he lit up. [Colloquial; mid-1800s]

light

In addition to the idioms beginning with light

  • light a fire under
  • light as a feather
  • light at the end of the tunnel
  • light dawned, the
  • lighten up
  • light heart
  • light into
  • lightning never strikes twice in the same place
  • light on
  • light out
  • light up

also see:

  • begin to see daylight (see the light of day)
  • bring to light
  • come to light
  • go light on
  • green light
  • heavy (light) heart
  • hide one's light
  • in a good (bad) light
  • in the cold light of day
  • in the light of
  • lace (light) into
  • leading light
  • make light of
  • many hands make light work
  • once over lightly
  • out cold (like a light)
  • see the light
  • shed light on
  • sweetness and light
  • travel light
  • trip the light fantastic
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.