Nearby words

  1. cookstown,
  2. cooktop,
  3. cooktown orchid,
  4. cookware,
  5. cooky,
  6. cool as a cucumber,
  7. cool bag,
  8. cool down,
  9. cool drink,
  10. cool hunter


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 forms

Synonym study

1. See cold. 5. See calm. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for cool off



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 Forms

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 cool off
Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with cool off

cool off


see cool down.


Also, cool down or out. Calm down, become less ardent, angry, or agitated, as in We can't discuss it until you've cooled off. The verb cool alone has been used in this sense since approximately a.d. 1000; off and down were added in the late 1800s, and Davy Crockett's Almanac (1836) had: “Resting a while, just long enough to cool out a little.”


Also, cool out. Kill someone, as in They threatened to cool off his brother. [Slang; first half of 1800s] Also see cool out, def. 2.


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.