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

      

    cool

     verb
    verb
    BrE BrE//kuːl//
     
    ; NAmE NAmE//kuːl//
     
    Verb Forms present simple I / you / we / they cool
    BrE BrE//kuːl//
     
    ; NAmE NAmE//kuːl//
     
    he / she / it cools
    BrE BrE//kuːlz//
     
    ; NAmE NAmE//kuːlz//
     
    past simple cooled
    BrE BrE//kuːld//
     
    ; NAmE NAmE//kuːld//
     
    past participle cooled
    BrE BrE//kuːld//
     
    ; NAmE NAmE//kuːld//
     
    -ing form cooling
    BrE BrE//ˈkuːlɪŋ//
     
    ; NAmE NAmE//ˈkuːlɪŋ//
     
     
    jump to other results
    become colder
  1. 1  [intransitive, transitive] to become or to make somebody/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. Word Origin Old English cōl (noun), cōlian (verb), of Germanic origin; related to Dutch koel, also to cold.Extra examples Allow the cake to cool thoroughly before removing it from the tin. Dry soil cools rapidly when air temperatures fall. He went for a swim to cool off. He’s cooled down somewhat since this morning, Her enthusiasm for the idea had cooled considerably. Her tea was slowly cooling in front of her. His temper had cooled slightly by this time. An electric fan is designed to cool the engine. I think you should wait until she’s cooled down a little. Let things cool off for a while. Relations between them have definitely cooled.Idioms (informal) to have to wait for somebody/something (informal) used to tell somebody to be calmer and less excited or angry Hey! Cool it! Don’t get so excited! Phrasal Verbscool downcool down somebodycool down somethingcool out
See the Oxford Advanced American Dictionary entry: cool