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Noun: fifth wheel
  1. Someone or something that is unwanted and unneeded
    - deadwood
     
  2. An extra car wheel and tire for a four-wheel vehicle
    - spare
     
  3. A steering bearing that enables the front axle of a horse-drawn wagon to rotate

Derived forms: fifth wheels

Type of: bearing, car wheel, redundance, redundancy, superfluousness

Encyclopedia: Fifth wheel

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fifth
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