Origin of cooler

First recorded in 1565–75; cool + -er1



adjective, cool·er, cool·est.

moderately cold; neither warm nor cold: a rather cool evening.
feeling comfortably or moderately cold: I'm perfectly cool, but open the window if you feel hot.
imparting a sensation of moderate coldness or comfortable freedom from heat: a cool breeze.
permitting such a sensation: a cool dress.
not excited; calm; composed; under control: to remain cool in the face of disaster.
not hasty; deliberate: a cool and calculated action.
lacking in interest or enthusiasm: a cool reply to an invitation.
lacking in warmth or cordiality: a cool reception.
calmly audacious or impudent: a cool lie.
aloof or unresponsive; indifferent: He was cool to her passionate advances.
unaffected by emotions; disinterested; dispassionate: She made a cool appraisal of all the issues in the dispute.
Informal. (of a number or sum) without exaggeration or qualification: a cool million dollars.
(of colors) with green, blue, or violet predominating.
  1. great; fine; excellent: a real cool comic.
  2. characterized by great facility; highly skilled or clever: cool maneuvers on the parallel bars.
  3. socially adept: It's not cool to arrive at a party too early.
  4. acceptable; satisfactory; okay: If you want to stay late, that's cool.


Informal. coolly.


  1. (used to express acceptance): Okay, cool! I'll be there at 10:00.
  2. (used to express approval, admiration, etc.): He got the job? Cool!


something that is cool; a cool part, place, time, etc.: in the cool of the evening.
calmness; composure; poise: an executive noted for maintaining her cool under pressure.

verb (used without object)

to become cool (sometimes followed by down or off): The soup cooled in five minutes. We cooled off in the mountain stream.
to become less ardent, cordial, etc.; become moderate.

verb (used with object)

to make cool; impart a sensation of coolness to.
to lessen the ardor or intensity of; allay; calm; moderate: Disappointment cooled his early zealousness.

Verb Phrases

cool down, to bring the body back to its normal physiological level after fast, vigorous exercise or activity by gradually slowing the pace of activity or by doing gentle exercises or stretches.
cool off, Informal. to become calmer or more reasonable: Wait until he cools off before you talk to him again.
cool out, Slang. to calm or settle down; relax: cooling out at the beach.

Origin of cool

before 1000; Middle English cole, Old English cōl; cognate with Middle Low German kōl, Old High German kuoli (German kuhl). See cold, chill
Related formscool·ing·ly, adverbcool·ish, adjectivecool·ly, adverbcool·ness, nouno·ver·cool, adjectiveo·ver·cool·ly, adverbo·ver·cool·ness, nounre·cool, verbsub·cool, verb (used with object)ul·tra·cool, adjectiveun·cooled, adjectivewell-cooled, adjective

Synonyms for cool

Synonym study

1. See cold. 5. See calm.

Antonyms for cool

1, 3, 4, 7, 8. warm. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for cooler

container, refrigerant, icebox

Examples from the Web for cooler

Contemporary Examples of cooler

Historical Examples of cooler

British Dictionary definitions for cooler



a container, vessel, or apparatus for cooling, such as a heat exchanger
a slang word for prison
a drink consisting of wine, fruit juice, and carbonated water



moderately colda cool day
comfortably free of heata cool room
producing a pleasant feeling of coldnessa cool shirt
able to conceal emotion; calma cool head
lacking in enthusiasm, affection, cordiality, etca cool welcome
calmly audacious or impudent
informal (esp of numbers, sums of money, etc) without exaggeration; actuala cool ten thousand
(of a colour) having violet, blue, or green predominating; cold
(of jazz) characteristic of the late 1940s and early 1950s, economical and rhythmically relaxed
informal sophisticated or elegant, esp in an unruffled way
informal excellent; marvellous


not standard in a cool manner; coolly


coolnessthe cool of the evening
slang calmness; composure (esp in the phrases keep or lose one's cool)
slang unruffled elegance or sophistication


(usually foll by down or off) to make or become cooler
(usually foll by down or off) to lessen the intensity of (anger or excitement) or (of anger or excitement) to become less intense; calm down
cool it (usually imperative) slang to calm down; take it easy
cool one's heels to wait or be kept waiting
See also cool out
Derived Formscoolingly, adverbcoolingness, nouncoolish, adjectivecoolly, adverbcoolness, noun

Word Origin for cool

Old English cōl; related to Old Norse kōlna, Old High German kuoli; see cold, chill
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 cooler

1570s, "a vessel in which something is set to cool," agent noun from cool (v.). Meaning "insulated box to keep things cool" is from 1958. Slang meaning "jail" is attested from 1884.



Old English col "not warm" (but usually not as severe as cold), also, of persons, "unperturbed, undemonstrative," from Proto-Germanic *koluz (cf. Middle Dutch coel, Dutch koel, Old High German kuoli, German kühl "cool," Old Norse kala "be cold"), from PIE root *gel- "cold, to freeze" (see cold (adj.)).

Applied since 1728 to large sums of money to give emphasis to amount. Meaning "calmly audacious" is from 1825. Slang use for "fashionable" is 1933, originally Black English; modern use as a general term of approval is from late 1940s, probably from bop talk and originally in reference to a style of jazz; said to have been popularized in jazz circles by tenor saxophonist Lester Young. Related: Coolly.



c.1400, "coldness, coolness," from cool (adj.). Meaning "one's self-control, composure" (the thing you either keep or lose) is from 1966.



Old English colian, "to lose warmth," also figuratively, "to lose ardor," from the root of cool (adj.). Meaning "to cause to lose warmth" is from late 14c. Related: Cooled; cooling.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with cooler


In addition to the idioms beginning with cool

  • cool as a cucumber
  • cool down
  • cool it
  • cool off
  • cool one's heels
  • cool out

also see:

  • keep cool
  • keep one's cool
  • play it cool
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.