1. a loud electric horn or alarm device, especially one used on vehicles or ships
Usage: often used on older or vintage vehicles; can also refer to any loud warning signal or alarm

Examples

• The old car's claxon blared loudly as it backed up.
• The ship's claxon sounded to warn nearby vessels.
• He pressed the claxon button on the bicycle handlebar.
• The factory claxon announced the end of the work shift.
• The vintage motorcycle had a distinctive claxon horn.
• When the fire alarm went off, the claxon echoed through the building.