chill_out
1. [ verb ] become quiet or calm, esp. after a state of agitation
Synonyms: calm_down settle_down cool_off simmer_down cool_it calm
Examples:

"After the fight both men need to cool off." "It took a while after the baby was born for things to settle down again."

Related terms: change_state composure
Similar spelling:   cull_out
  call_out
  chilled