Definition of "cooler"

cooler

/ˈkuːl.ə(ɹ)/

noun
plural coolers
1. Anything which cools.
  Quotations
  If acid Things were used only as Coolers, they would not be so proper in this Case.
  1731, John Arbuthnot, An Essay Concerning the Nature of Aliments, and the Choice of Them, According to the Different Constitutions of Human Bodies. […], 1st Irish edition, Dublin: […] S. Powell, for George Risk, […], George Ewing, […], and William Smith, […]
2. An insulated bin or box used with ice or freezer packs to keep food or beverages cold while picnicking or camping.
3. A device for refrigerating dead bodies in a morgue.
4. (Canada, South Africa, countable or uncountable) A type of drink made with alcohol, especially wine, mixed with fruit juice.
5. (Philippines, countable) A serving of samalamig.
6. (US, slang) A prison.
  Quotations
  About a year or so back we had him in the cooler on a Mann Act rap.
  1939, Raymond Chandler, The Big Sleep
7. (US, slang) A bouncer or doorman.
8. (poker, gambling, colloquial) A cold deck.
9. (poker) A loss suffered while holding a hand which is ordinarily strong, especially one which involves the loss of many chips.
adjective
1. comparative form of cool: more cool