Related Clues:

• ''Heads up!'' and others
• "Fore!" and "Duck!"
• Bells and whistles, maybe
• Puts on notice
• Warning notices
• ''Fore!'' and ''Duck!''
• Sounds an alarm
• Puts on guard, warns
• Warns of impending danger
• Puts on guard, forewarns
• Draws attention to, a danger perhaps
• Puts on guard
• Warns, draws attention to
• Forewarns, puts on guard
• Puts on guard, warns about danger