Related Clues:

• Silently shows agreement
• Starts to fall asleep
• Becomes careless
• Silently accedes
• Bridge action
• Agrees quietly
• Gives a signal
• eBay action
• Reacts to a long speech, maybe
• OKs you can't hear
• Affirmative actions?
• Grows sleepy
• Bridge calls
• Signals OK
• Contractors' offerings