WordReference Random House Learner's Dictionary of American English © 2019
cool•er /ˈkulɚ/USA pronunciation   n. [countable]
  1. a container for keeping something cool:The cooler was loaded with soda.
  2. water cooler :People stood around the cooler chatting.
  3. Slang Terms[usually: the + ~] jail.

WordReference Random House Unabridged Dictionary of American English © 2019
cool•er  (ko̅o̅lər),USA pronunciation n. 
  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;
  3. an air conditioner.
  4. Food, Winea tall drink, consisting of liquor, soda, and a fruit garnish.
  5. See  water cooler. 
  6. Slang Termsthe cooler, jail:He was in the cooler for three months for petty theft.
  7. Sport[Ice Hockey Slang.]See  penalty box. 
  • cool + -er1 1565–75

Collins Concise English Dictionary © HarperCollins Publishers::

cooler /ˈkuːlə/ n
  1. a container, vessel, or apparatus for cooling, such as a heat exchanger
  2. a drink consisting of wine, fruit juice, and carbonated water

'cooler' also found in these entries:

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