Related Clues:

• Acknowledge quietly
• Acknowledge wordlessly
• Signal silently to
• Show silent approval of
• Acknowledge without a word
• Acknowledge refusal to put time into party
• Give the O.K
• Acknowledge without words
• Acknowledge nonverbally
• Agree with silently
• Greet wordlessly
• Recognize silently
• Say yes to without saying 'yes'
• Greet subtly
• Acknowledge surreptitiously, maybe