Related Clues:

• Signals OK
• Head-shaking answers
• Gives a heady reply?
• Signs an agreement?
• Bean dips?
• Bobblehead doll actions
• Tacit assents
• Unspoken agreements?
• Acknowledgments
• Agrees tacitly
• Some yeses
• Consents silently
• Some okays
• Assents noiselessly
• Misses part of the lecture, perhaps