[1] : WordNet (r) 2.0

chill out
     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, cool off, simmer
         down, settle down, cool it
see also:
calm calm down cool off simmer down settle down cool it 

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