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  1. fifth wheel

    • n.
      an extra wheel for a four-wheeled vehicle.;a superfluous person or thing.
    • noun: fifth wheel, plural noun: fifth wheels

    • 釋義

    名詞

    • 1. an extra wheel for a four-wheeled vehicle.
    • informal a superfluous person or thing.
    • 2. a coupling between a vehicle used for towing and a trailer.
    • a trailer with accommodation for camping out.
    • historical a horizontal turntable over the front axle of a carriage as an extra support to prevent it tipping.