Possible Clues:

• Shout from the Wizard of Oz
• Shut up
• It is golden acccording to the 1960s song
• Not a sound was heard when license (sic) was removed
• You can break it merely by mentioning it
• Hamlet's rest, as disturbed by the French?
• Quiescence
• The peace subsequently broken by the French
• Our suffering won't be heard in this
• ''Quiet!''