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fifth wheel noun

  /-ˈwil/ , /-ˈwiːl/ , /ˌfɪfθ ˈʍil/ , /ˌfɪfθ ˈʍiːl/
  • (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.
 Sattelkupplung
  • (idiomatic, informal) Anything superfluous or unnecessary.
 fünftes Rad, fünftes Rad am Wagen
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