calm down

Verb

• become quiet or less intensive
  • the fighting lulled for a moment
    

• make calm or still
  • quiet the dragons of worry and fear
    

• 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.
    

Related words

• Synonyms: 
  lull , calm , quiet , tranquilize , tranquillize , tranquillise , quieten , still , cool off , chill out , simmer down , settle down , cool it
• Antonyms: 
  agitate , rouse , turn on , charge , commove , excite , charge up