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Verb: simmer down  si-mur dawn
Usage: informal
  1. Become quiet or calm, especially after a state of agitation
    "After the fight both men need to simmer down.";
    - calm, calm down, cool off, chill out [informal], settle down, cool it [informal], wind down, take a chill pill [informal], take it easy [informal]

Derived forms: simmering down, simmered down, simmers down

Type of: change state, turn