Possible Clues:

• “Quiet!”
• Gag produces a quiet admonition at uni­versity
• Restraining order
• Suppress mention of
• It's hard on you and me having huge half of pressure to sweep under the carpet
• Suppress information or rumours
• Cover up, keep quiet
• Suppress public mention of (something)
• Change first part of exercise from soft to hard in silence
• 'Be quiet!'