1. a rod or bar on which a wheel or pair of wheels revolves

Examples

• The car’s front axle was damaged in the accident.
• The wagon wheel spins freely on its wooden axle.
• Mechanics had to replace the broken rear axle.
• The bicycle’s axle needs to be greased regularly.
• Heavy trucks have multiple axles to distribute weight.
• The axle connects the two wheels on each side of the vehicle.