Related Clues:

• Greet from afar
• Signal, in a way
• Indicate agreement with
• Greet, in a way
• Acknowledge tacitly
• Show agreement with
• Relay a bid, as to an auctioneer
• Give a head signal to
• Greet silently
• Tacitly acknowledge
• Greet nonverbally
• Acknowledge silently
• Say 'yes' to silently
• Acknowledge in passing
• Greet from across the street