cool off
     v 1: 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
Source: WordNet® 2.0