Related Clues:

• Give the OK for
• Greet silently
• Signal, perhaps
• Give the green light to
• Bob one's head at
• "___ me to introduce myself"
• Acknowledge silently
• Give a nonverbal 'OK'
• Acknowledge with a head movement
• Grant permission
• Signal agreement
• Consent to
• Permit or concede
• Permit, consent to
• Permit or agree