Synonyms for (verb) simmer down
Synonyms: chill out, calm, calm down, settle down, simmer down, cool it, cool off
Definition: become quiet or calm, especially after a state of agitation
Usage: After the fight both men need to cool off.; It took a while after the baby was born for things to settle down again.
Similar words: turn, change state
Definition: undergo a transformation or a change of position or action
Usage: We turned from Socialism to Capitalism; The people turned against the President when he stole the election