Related Clues:

• Land to which Cain fled
• Signal at Sotheby's
• 'Hey, you!'
• O.K. sign, maybe
• 'Want to hear a secret?'
• Call to attention
• Flirtatious signal
• Acknowledge
• O.K.
• 'Hey!'
• Go-ahead
• 'Yoo-hoo!'
• Conversation starter
• [Get the joke?]
• Doze (off)