Answer: silenceisgolden

AnswerCrossword Clue
SILENCEISGOLDEN

"Quiet!" . . . at finishing school

SILENCEISGOLDEN

"Zip your lip!"

SILENCEISGOLDEN

Library motto?

SILENCEISGOLDEN
"Shhhh!" prompter
SILENCEISGOLDEN
Admonition to a noisy child
SILENCEISGOLDENThe squeaky wheel gets the grease, but also...
SILENCEISGOLDENMaxim violated by a stool pigeon
SILENCEISGOLDENTitle for M. Marceau's memoirs?
SILENCEISGOLDENAdage for a dumb blonde?
SILENCEISGOLDENAdage for a librarian
SILENCEISGOLDENLibrarian's line, maybe
SILENCEISGOLDENPolite words for shut up
SILENCEISGOLDENMob's maxim
SILENCEISGOLDENCogent motto.
SILENCEISGOLDENLibrarian's line, perhaps
SILENCEISGOLDENMaxim for the mum
SILENCEISGOLDENLibrarian's credo?
SILENCEISGOLDENMum's the word?
SILENCEISGOLDENLibrarian's motto, perhaps