Synonyms

fifth-wheel trailer

fifth-wheel trailer

[fifth-hweel, -weel or, often, fith-] .
noun
See under fifth wheel (def. 3).
Dictionary.com Unabridged

fifth wheel

noun
1.
a horizontal ring or segment of a ring, consisting of two bands that slide on each other, placed above the front axle of a carriage and designed to support the forepart of the body while allowing it to turn freely in a horizontal plane.
2.
a similar device used as a coupling to connect a semitrailer to a tractor.
3.
a similar coupling between a heavy-duty pickup truck and a camping trailer (fifth-wheel trailer) that extends over the bed of the truck.
4.
an extra wheel for a four-wheeled vehicle.
5.
a superfluous, unneeded, or unwanted person or thing: They enjoy making any outsider feel like a fifth wheel.

Origin:
1870–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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American Heritage
Cultural Dictionary

fifth wheel definition


A hanger-on; a person who serves no function: “The vice president felt like a fifth wheel after his exclusion from the committee.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary

fifth wheel definition


  1. n.
    an extra and unneeded person. : I feel like such a fifth wheel around here.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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