Related Clues:

• Common consent
• Subtle ''Over here!''
• Wordless response
• React to boredom
• It precedes 'Over here!'
• It may turn some heads
• Subtle attention getter
• "Hey, you!"
• Furtive whisper
• Partner of Wynken
• [Look over here!]
• Show approval, in a way
• Sotto voce call
• Subtler alternative to 'Yo!'
• Show agreement, in a way