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Wiktionary
cool down

vb. 1 (context intransitive English) To become cooler, to be reduced in temperature. 2 (context transitive English) To cause the temperature of an item to decrease. 3 (context intransitive English) To become less agitated. 4 (context transitive English) To cause to become less agitated.

WordNet
cool down
  1. v. make cool or cooler; "Chill the food" [syn: cool, chill] [ant: heat]

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

  3. loose heat; "The air cooled considerably after the thunderstorm" [syn: cool, chill] [ant: heat]