Related Clues:

• Stop talking
• Refuse to talk
• Refuse to speak
• Become silent
• ''Don't say a word!''
• Zip one's lip
• Button one's lip
• Not say a word
• "Don't say a word!"
• Refuse to talk like large shellfish?
• Refuse to talk, like a shellfish
• Refuse to talk- like shellfish?
• Refuse to talk, be like shellfish
• Fall silent
• 'Fall silent and refuse to talk (4,2)'