Related Clues:

• Agrees quietly
• Gives a signal
• Approves, briefly
• Reacts to a long speech, maybe
• OKs you can't hear
• Blesses
• Affirmative actions?
• Grows sleepy
• Some responses
• Accedes
• Gives approval
• Signals OK
• Permissions
• Head-shaking answers
• Verbal stamps of approval