Related Clues:

• Bobblehead doll actions
• Tacit assents
• Unspoken agreements?
• Acknowledgments
• Agrees tacitly
• Some yeses
• Consents silently
• Some okays
• Assents noiselessly
• Misses part of the lecture, perhaps
• Endorsements
• Indicates it's OK
• Assents, in a way
• Subtle signals
• Shows approval