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WordReference Random House Unabridged Dictionary of American English © 2024fifth′ wheel′, - Transporta horizontal ring or segment of a ring, consisting of two bands that slide on each other, placed above the front axle of a carriage and designed to support the forepart of the body while allowing it to turn freely in a horizontal plane.
- Transporta similar device used as a coupling to connect a semitrailer to a tractor.
- Automotive, Transporta similar coupling between a heavy-duty pickup truck and a camping trailer (fifth-wheel trailer) that extends over the bed of the truck.
- Transportan extra wheel for a four-wheeled vehicle.
- a superfluous, unneeded, or unwanted person or thing:They enjoy making any outsider feel like a fifth wheel.
Collins Concise English Dictionary © HarperCollins Publishers:: fifth wheel n - a spare wheel for a four-wheeled vehicle
- a superfluous or unnecessary person or thing
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