Related Clues:

• Silently accedes
• Agrees quietly
• Gives a signal
• Reacts to a long speech, maybe
• OKs you can't hear
• Affirmative actions?
• Grows sleepy
• Accedes
• Gives approval
• Signals OK
• Head-shaking answers
• Gives a heady reply?
• Signs an agreement?
• Says 'OK'
• Silent answers