Wiktionary:Word of the day/2020/May 28

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Word of the day
for May 28
fifth wheel n (chiefly US)
  1. (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.
    1. 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.
  2. (road transport, historical) A horizontal wheel or segment of a wheel above the front axle and beneath the body of a carriage, forming an extended support to prevent it from overturning.
  3. (idiomatic, informal) Anything superfluous or unnecessary.
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