calm down
     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}, {cool off}, {chill out}, {simmer
          down}, {settle down}, {cool it}]
     2: make calm or still; "quiet the dragons of worry and fear"
        [syn: {calm}, {quiet}, {tranquilize}, {tranquillize}, {tranquillise},
         {quieten}, {lull}, {still}] [ant: {agitate}]
     3: become quiet or less intensive; "the fighting lulled for a
        moment" [syn: {lull}]
Source: WordNet® 2.0