quiet down
Beginner (A2)neutral
To stop making so much noise, or to make someone else be quieter.
"The audience quieted down as soon as the lights dimmed and the show began."
Hear it in context

We got challenged by the OUTDOOR BOYS after talking too much!
Guga · 9:31
Quiet down.

Then and Now: Series 33 Special | The Graham Norton Show
The Graham Norton Show · 18:15
Quiet down there.

English on the Laptop 💻 #learnenglish #english #englishforbeginners
English by Jay - Sprout · 0:29
Time to quiet down.

Parks and Rec Moments to WATCH While You Eat
Parks and Recreation · 22:57
Can you quiet down, please?

PROOF The Salad Outbreak Wouldn't Have Hit Pawnee | Parks and Recreation
Parks and Recreation · 1:23
Can you quiet down, please?