phrasal verb quieten
If someone or something quietens down
or if you quieten
, they become less noisy
or less active.
The labour unrest which swept the country last week has quietened down.
Somehow I managed to quieten her down.
regional note: in AM, usually use quiet down
Tom's words before the match might also have quietened down our own supporters.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers