Related Clues:

• Sound horn
• Arcade game sound
• Backing-up sound
• Appliance signal
• Sound confirming a locked car door
• Horn's honk
• Smoke alarm sound
• What a goose lets loose
• Honk cousin
• Verb on many a bumper sticker
• Palindromic blast
• 26-Down sound
• Driver's protest
• It might mean ''Move it!''
• Bout of barhopping