Nearby words

  1. niggerhead,
  2. niggle,
  3. niggling,
  4. nigglingly,
  5. nigh,
  6. night and day,
  7. night blindness,
  8. night bolt,
  9. night coach,
  10. night court


    night and day,
    1. unceasingly; continually: She worked night and day until the job was done.
    2. a complete difference; completely different: The improvement in her grades after tutoring was like night and day.
    Also day and night.

Origin of night

before 900; Middle English; Old English niht, neaht, cognate with German Nacht, Gothic nahts, Latin nox (stem noct-), Greek nýx (stem nykt-)

Related formsnight·less, adjectivenight·less·ly, adverbnight·like, adjective

Can be confusedknight night Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for day and night



the period of darkness each 24 hours between sunset and sunrise, as distinct from day
(modifier) of, occurring, working, etc, at nighta night nurse
the occurrence of this period considered as a unitfour nights later they left
the period between sunset and retiring to bed; evening
the time between bedtime and morningshe spent the night alone
the weather conditions of the nighta clear night
the activity or experience of a person during a night
(sometimes capital) any evening designated for a special observance or function
nightfall or dusk
a state or period of gloom, ignorance, etc
make a night of it to go out and celebrate for most of the night
night and day continuallythat baby cries night and day
Related formsRelated adjective: nocturnal

Derived Formsnightless, adjectivenightlike, adjective

Word Origin for night

Old English niht; compare Dutch nacht, Latin nox, Greek nux

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 day and night


Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with day and night

day and night

see under night and day.


In addition to the idioms beginning with night

  • night and day
  • night owl

also see:

  • black as night
  • call it a day (night)
  • dead of (night)
  • different as night and day
  • good night
  • make a day (night) of it
  • ships that pass in the night
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.