Related Clues:

• Cautioner's word
• Word of greeting
• Tripled, Yogi Bear's catchphrase
• Sign on a fence, perhaps
• Sign on a gate
• "Yo!"
• "Watch it!"
• With 53-Across, a Beatles song
• 'Howdy!'
• Admonition to a klutz
• "Get your hands off me!"
• "You there!"
• Links cry
• Links cry
• Links warning