Definition of cool noun from the Oxford Advanced American Dictionary

 

cool

 noun
noun
NAmE//kul//
 
the cool[singular]
 
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  • cool air or a cool place the cool of the evening
  • Idioms
    keep your cool(informal)
     
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    to remain calm in a difficult situation He kept his cool on the convention floor when he was heckled by a young Republican.
    lose your cool(informal)
     
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    to become angry or excited I lost my cool and shouted at them.
    See the Oxford Advanced Learner's Dictionary entry: cool