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Wiktionary
cool off

vb. 1 (context intransitive English) To decrease in temperature, activity, or temper. 2 (context transitive English) To cause to decrease in temperature, activity or temper.

WordNet
cool off
  1. v. become quiet or calm, especially after a state of agitation; "After the fight both men need to cool off."; "It took a while after the baby was born for things to settle down again." [syn: calm, calm down, chill out, simmer down, settle down, cool it]

  2. lose intensity; "His enthusiasm cooled considerably" [syn: cool, cool down]

  3. feel less enamoured of something or somebody