Related Clues:

• "Can it!"
• "Keep it down!"
• Reject, slangily
• 'No go'
• "Stop talking!"
• Pig Latin refusal
• 'Shhh!,' not so politely
• Slangy turndown, and a hint to how 17-, 22-, 32-, 47- and 51-Across are formed
• "Zip it!"
• Retro refusal
• ''Don't do that!''
• Pig Latin 101 word
• 'No siree!'
• Informal warning
• Rude command to stop talking