Related Clues:

• You might catch one near a beach
• Say 'yes' to silently
• Acknowledge in passing
• Give a nonverbal 'OK'
• Undulate
• Acknowledge with a head movement
• Greet from across the street
• Agree with, tacitly
• Silently agree to
• Surfing need
• One might be caught near a beach
• Breaker, e.g.
• Hi from a float
• Breaker at the shore
• Signal agreement