Answer: hushup

AnswerCrossword Clue
HUSHUPStonewall it
HUSHUPKeep secret, as a scandal
HUSHUPKeep under wraps
HUSHUPKeep quiet
HUSHUP"Quiet!"
HUSHUPKeep under one's hat.
HUSHUPQuiet down.
HUSHUPBecome quiet
HUSHUPKeep secret
HUSHUP"Keep quiet!"
HUSHUPKeep it quiet
HUSHUPConceal