Related Clues:

• OK sign, maybe
• Indicate uh-huh
• React to a dull sermon, perhaps
• Signal at Christie's
• Nonverbal 'yes'
• "Go ahead" signal
• Nonverbal assent
• Indication of a green light
• Acknowledge silently
• Use your head positively?
• Wordless OK
• Wynken and Blynken's companion
• Why isn't one done?
• St. Nicholas gives one in 'A Visit From St. Nicholas'
• Visibly agree