Related Clues:

• Word on some fences
• Take heed
• "Be well"
• Caveat
• Watch out for
• Warning word
• Caveat starter
• Be cautious
• Word on a dog-owner's sign, perhaps
• Sign of danger
• 'Heads up!'
• Word of caution
• Jabberwock advice
• Start of a sign on a gate
• Spooky warning