Definition of simmer down phrasal verb from the Oxford Advanced American Dictionary

 

simmer down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

simmer down

(informal)
 
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to become calm after a period of anger or excitement I left him alone until he simmered down. Things have simmered down since the riots last week.
See the Oxford Advanced Learner's Dictionary entry: simmer down