Related Clues:

• Indicates agreement
• Auction bids
• Gestures 'yes'
• Unobtrusive signals
• Silently shows agreement
• Starts to fall asleep
• Becomes careless
• Silently accedes
• Agrees quietly
• Gives a signal
• Reacts to a long speech, maybe
• OKs you can't hear
• Affirmative actions?
• Grows sleepy
• Signals OK