fifth wheel

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Definitions by Wordnik

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

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