Definition of cool verb from the Oxford Advanced American Dictionary

     

    cool

     verb
    verb
    NAmE//kul//
     
    Verb Forms present simple I / you / we / they cool
     
    he / she / it cools
     
    past simple cooled
     
    -ing form cooling
     
     
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    become colder
  1. 1 [intransitive, transitive] to become or to make someone or something become cool or cooler Glass contracts as it cools. Melt the chocolate and allow it to cool slightly. cool something The cylinder is cooled by a jet of water. The evening breeze cooled her face.
  2. become calmer
  3. 2[intransitive] to become calmer, less excited, or less enthusiastic I think we should wait until tempers have cooled. Relations between them have definitely cooled (= they are not as friendly with each other as they were).
  4. Idioms
    cool your heels(informal)
     
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    to have to wait for someone or something
    cool it!(informal)
     
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    used to tell someone to be calmer and less excited or angry Hey! Cool it! Don't get so excited!
    Phrasal Verbscool down/offcool somebodydown/offcool somethingdown/offcool out
See the Oxford Advanced Learner's Dictionary entry: cool