Answer: STOWIT

AnswerCrossword Clue
STOWIT"Enough already!"
STOWIT"Enough said!"
STOWIT"That's enough out of you!"
STOWIT"Zip your lip!"
STOWIT"Shut up!"
STOWIT"Oh, shut up!"
STOWIT"Say no more!"
STOWIT"I've heard enough from you!"
STOWIT"Pipe down!"
STOWIT"No more lip!"
STOWIT"Shaddup!"
STOWIT"Shut your trap!"