S: (v) calm, calm down, cool off, chill out, simmer down, settle down, cool it (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."
S: (adj) calm, unagitated, serene, tranquil (not agitated; without losing self-possession) "spoke in a calm voice"; "remained calm throughout the uproar"; "he remained serene in the midst of turbulence"; "a serene expression on her face"; "she became more tranquil"; "tranquil life in the country"
S: (adj) calm ((of weather) free from storm or wind) "calm seas"