Answer: pipedown

AnswerCrossword Clue
PIPEDOWN

"Shh!" from a plumber?

PIPEDOWN

"Put a lid on it!"

PIPEDOWN

"Zip it!"

PIPEDOWN
"Shush!"
PIPEDOWN
Quiet, please!
PIPEDOWNDirective
PIPEDOWNGag order?
PIPEDOWNVoice command?
PIPEDOWN"Not so loud!"