pipe down
Intermediate (B1)informal
to be quiet or tell someone to be quiet
"The crowd finally piped down after a few minutes."
Hear it in context

Every Time SpongeBob Leaves Bikini Bottom 🚌 w/ Patrick | 2 Hours | SpongeBob
SpongeBob SquarePants Official · 70:26
EVERYBODY PIPE DOWN.

1 Hour of Season 5 That Kept the Streak Alive
The Big Bang Theory · 30:51
Do you know how TO PIPE DOWN?

Scott Horton: The Case Against War and the Military Industrial Complex | Lex Fridman Podcast #478
Lex Fridman · 595:42
So the rest of Washington pipe down, right?

SIDEMEN HIDE & SEEK ON A FARM
Sidemen · 19:51
That's what Hey, you we everyone pipe down.

TMZ Is FINALLY Using Their Powers for Good
Brett Cooper · 14:01
So just like pipe down and let them try again.