Related Clues:

• Give silent assent
• Partner of Wynken and Blynken
• Silent greeting
• Wordless greeting
• Drowsy droop
• Silent go-ahead
• It becomes rude if you don't use your hand
• Signal an OK
• Boredom indicator
• Silent 'OK'
• Display boredom, in a way
• Subtle signal
• Genesis land
• Across-the-room signal
• Auction indication