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fifth wheel

   Also found in: Acronyms, Idioms, Encyclopedia, Wikipedia, Hutchinson 0.09 sec.
fifth wheel
n.
1.
a. A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns.
b. A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer.
2. An additional wheel carried on a four-wheeled vehicle as a spare.
3. An extra and unnecessary person or thing.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.fifth wheelfifth wheel - someone or something that is unwanted and unneeded
redundance, redundancy - the attribute of being superfluous and unneeded; "the use of industrial robots created redundancy among workers"
2.fifth wheel - an extra car wheel and tire for a four-wheel vehicle
car wheel - a wheel that has a tire and rim and hubcap; used to propel the car
3.fifth wheel - a steering bearing that enables the front axle of a horse-drawn wagon to rotate
bearing - a rotating support placed between moving parts to allow them to move easily


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1) The Fifth Wheel Bluegrass Band performs as part of a free folk music and bluegrass festival during the Encino Chamber of Commerce's 19th annual Taste of Encino street fair on Sunday.
In an effort to bring knowledge, training and awareness about workplace health and safety to their clients, Sudbury entrepreneurs Denis Desroches and Marc Ranger have fully refurbished the fifth wheel to suit their educational needs.
But did we want a regular trailer or a fifth wheel, in which the trailer's front end pivots on a massive fitting bolted into the truck bed?
 
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