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English word:    
fifth   wheel  

fifth wheel

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fifth wheel in WordNet English dictionary

noun
  1. someone or something that is unwanted and unneeded
    fifth wheel  deadwood 
  2. a steering bearing that enables the front axle of a horse-drawn wagon to rotate
    fifth wheel 
  3. an extra car wheel and tire for a four-wheel vehicle
    fifth wheel  spare 
WordNet Lexical Database v3.0, © 2006 Princeton University


fifth wheel in English Wiktionary

 
  1. (noun) A type of trailer hitch, which consists of a horseshoe-shaped plate on a multi-directional pivot, with a locking pin to couple with the kingpin of a truck trailer.
  2. (noun) A very large truck trailer; an 18-wheeler.
  3. (noun) A very large trailer that is towed with a pickup truck.
  4. (noun) (idiom) Anything superfluous or unnecessary.
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