fifthwheel

fifthwheel
fifth wheel n.
1.
a. A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns.
b. A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer.
2. An additional wheel carried on a four-wheeled vehicle as a spare.
3. An extra and unnecessary person or thing.

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Universalium. 2010.

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