Definition of cool noun from the Oxford Advanced Learner's Dictionary



BrE BrE//kuːl//
; NAmE NAmE//kuːl//
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  • the cool [singular] cool air or a cool place the cool of the evening
  • Word Origin Old English cōl (noun), cōlian (verb), of Germanic origin; related to Dutch koel, also to cold.Idioms (informal) to remain calm in a difficult situation He kept his cool on the convention floor when he was heckled by a young Republican. (informal) to become angry or excited I lost my cool and shouted at them.
    See the Oxford Advanced American Dictionary entry: cool