Answer: shutup

AnswerCrossword Clue
SHUTUPImprisoned.
SHUTUPGag
SHUTUP"Stifle!"
SHUTUPPipe down!
SHUTUP"Quit yakkin'!"
SHUTUPStifle!
SHUTUPKeep quiet!
SHUTUP"I've heard enough!"
SHUTUP"Shhh!," not so politely
SHUTUP"Stop talking!"
SHUTUPImprisoned
SHUTUPBe quiet!
SHUTUPConfine
SHUTUP... shop.
SHUTUPPeremptory command.
SHUTUPPut a cork in it!
SHUTUPClose.
SHUTUPCease speaking: Colloq.
SHUTUPStop talking: Colloq.
SHUTUPSilence
SHUTUPRestraining order?
SHUTUP"Zip it!"
SHUTUP"Close your trap!"
SHUTUP"Not another word out of you!"
SHUTUP"Close yer face!"
SHUTUP"Zip your lip!"
SHUTUP"Can it!"
SHUTUPButton your lip!
SHUTUP"Pipe down!"