calm down

verbs

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."
calm, calm down, chill out, cool it, cool off, settle down, simmer down
make calm or still
"quiet the dragons of worry and fear"
calm, calm down, lull, quiet, quieten, still, tranquilize, tranquillise, tranquillize
become quiet or less intensive
"the fighting lulled for a moment"
calm down, lull