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fifth wheel noun

  /-ˈwil/ , /-ˈwiːl/ , /ˌfɪfθ ˈʍil/ , /ˌfɪfθ ˈʍiːl/
  • (idiomatic, informal) Anything superfluous or unnecessary.
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  • (road transport) A type of trailer hitch, which consists of a horseshoe-shaped plate on a multidirectional pivot, with a locking pin to couple with the kingpin of a truck trailer.
  • In full, fifth-wheel trailer: a large caravan or travel trailer that is connected to a pickup truck for towing by a hitch similar to the one described in sense 1 located in the center of the truck's bed.
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