[ koo-ler ]
See synonyms for cooler on
  1. a container or apparatus, as an insulated chest, in which something may be cooled or kept cool.

  2. anything that cools or makes cool; refrigerant.

  1. an air conditioner.

  2. a tall drink, consisting of liquor, soda, and a fruit garnish.

  3. the cooler, Slang. jail: He was in the cooler for three months for petty theft.

  4. Ice Hockey Slang. penalty box.

Origin of cooler

First recorded in 1565–75; cool + -er1

Words Nearby cooler Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use cooler in a sentence

  • If you use it wisely, it may be Ulysses' hauberk; if you reject it, the shirt of Nessus were a cooler winding-sheet!

  • Say, old-timer, is it right about Mac losing his stripes and getting thirty days in the cooler?

    Raw Gold | Bertrand W. Sinclair
  • A cool head, his; never a cooler brought thought to bear upon perplexity; nevertheless it was not feeling very collected now.

    Elster's Folly | Mrs. Henry Wood
  • Donald has a still cooler head than his neighbour John Bull, and that is saying a good deal.

    Friend Mac Donald | Max O'Rell
  • Lifted upward, the air as it ascends the slopes is brought into cooler and more rarefied conditions.

    Outlines of the Earth's History | Nathaniel Southgate Shaler

British Dictionary definitions for cooler


/ (ˈkuːlə) /

  1. a container, vessel, or apparatus for cooling, such as a heat exchanger

  2. a slang word for prison

  1. a drink consisting of wine, fruit juice, and carbonated water

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