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  1. fifth wheel

    • n.
      a superfluous person or thing;a trailer with accommodation for camping out
    • noun: fifth-wheel trailer, plural noun: fifth-wheel trailers

    • 釋義

    名詞

    • 1. informal a superfluous person or thing I was the fifth wheel to two sets of coupled-up friends Kayla is a fifth wheel in a group of four high-schoolers meeting at the mall food court
    • 2. a trailer with accommodation for camping out they sold their house, bought a fifth wheel, and started travelling all over the US the truck was towing a thirty-foot fifth wheel trailer
    • 3. a coupling between a vehicle used for towing and a trailer.
    • historical a horizontal turntable over the front axle of a carriage as an extra support to prevent it tipping.