Related Clues:

• Fricative admonishment
• 'Quiet down'
• Silent segment of five of this puzzle’s Down answers
• Common cinema sound, and title of puzzle
• Test proctor's interjection
• "Zip it up!"
• Library reprimand
• 'I'm trying to listen!'
• Response to a breach of movie theater etiquette
• Theatergoer's reproof
• 'Use your inside voice'
• "Use your inside voice"
• The sound of "Silence!"
• 'Can't you see, people are trying to work!'
• Request for restraint