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A type of trailer hitch, which consists of a horseshoe-shaped plate on a multi-directional pivot, with a locking pin to couple with the kingpin of a truck trailer.

Additional definitions for 'fifth wheel':

fifth wheelA very large trailer that is towed with a pickup truck.
fifth wheelA very large truck trailer; an 18-wheeler.
fifth wheelAnything superfluous or unnecessary.
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"fifth wheel." Phrases.net. STANDS4 LLC, 2017. Web. 20 Nov. 2017. <http://www.phrases.net/phrase/fifth-wheel_3589>.

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