Related Clues:

• Go-ahead signal
• 'Ain't gonna happen!'
• Approval, so to speak
• Show boredom
• Subtle auction bid indicator
• Make a slip
• Bedtime "Land"
• OK sign, maybe
• Indicate uh-huh
• Signal at Christie's
• Nonverbal 'yes'
• Bob one's head at
• "Go ahead" signal
• Nonverbal assent
• Indication of a green light