Answer: quitit

AnswerCrossword Clue
QUITIT"Enough!"
QUITIT"Stop that!"
QUITITWarning to a brat
QUITITWarning to a pest
QUITIT"That's enough!"
QUITIT"Enough already!"
QUITIT"Stop bugging me!"
QUITIT"Cut that out!"
QUITIT"Knock that off!"
QUITIT"Stop!"
QUITIT"Enough is enough!"
QUITITAnnoyed demand to a sibling
QUITIT'Stop that!'