Related Clues:

• 'Concentrate!'
• Conversation opener
• "Stop it!"
• Concen-tration
• 'You there!'
• Attention-getting call
• "You, there!"
• "Howdy!"
• "Listen!"
• Lend an ear
• 'Get ready!'
• Word of greeting
• Tripled, Yogi Bear's catchphrase
• "Yo!"
• "Watch it!"