fifth wheel

Noun
  1. Someone or something that is unwanted and unneeded (synset 105127864)
    is a type of: redundance, redundancy - the attribute of being superfluous and unneeded
    same as: deadwood
  2. An extra car wheel and tire for a four-wheel vehicle (synset 103339857)
    is a type of: car wheel - a wheel that has a tire and rim and hubcap; used to propel the car
    same as: spare
  3. A steering bearing that enables the front axle of a horse-drawn wagon to rotate (synset 103339720)
    is a type of: bearing - a rotating support placed between moving parts to allow them to move easily

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