Related Clues:

• Symbols
• Unobtrusive signals
• Silently shows agreement
• Starts to fall asleep
• Becomes careless
• Silently accedes
• Inks
• Burma Shave ad units
• Agrees quietly
• Gives a signal
• Reacts to a long speech, maybe
• Some campaign expenses
• OKs you can't hear
• Affirmative actions?
• Grows sleepy