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.")
sedate, calm, tranquilize, tranquillize, tranquillise -- (cause to be calm or quiet as by administering a sedative to; "The patient must be sedated before the operation")
Overview of adj calm
The adj calm has 2 senses
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")
calm -- ((of weather) free from storm or wind; "calm seas")