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  1. fifth wheel

    • IPA[ˌfi(f)TH ˈ(h)wēl]
    • n.
      an extra wheel for a four-wheeled vehicle.;a superfluous person or thing.
    • noun: fifth wheel, plural noun: fifth wheels

    • 釋義


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