Related Clues:
- Acknowledge quietly
- Silently acknowledge
- 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
- Agree with silently
- Greet wordlessly
- Recognize silently
- Say yes to without saying 'yes'
- Greet subtly
- Acknowledge surreptitiously, maybe