fifth wheel

/fɪ(f)θ wil/

/fɪ(f)θ hwil/

Other forms: fifth wheels

Definitions of fifth wheel
  1. noun
    someone or something that is unwanted and unneeded
    synonyms: deadwood
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    type of:
    redundance, redundancy
    the attribute of being superfluous and unneeded
  2. noun
    a steering bearing that enables the front axle of a horse-drawn wagon to rotate
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    type of:
    bearing
    a rotating support placed between moving parts to allow them to move easily
  3. noun
    an extra car wheel and tire for a four-wheel vehicle
    synonyms: spare
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    type of:
    car wheel
    a wheel that has a tire and rim and hubcap; used to propel the car
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