third wheel

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third wheel

Someone who has no real place or purpose in a situation, likened to a superfluous extra wheel on a two-wheeled vehicle. When Kelly invited me to go to the movies, I didn't know that her boyfriend would be joining us. I felt like a third wheel the entire night.
See also: third, wheel
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a fifth/third ˈwheel

(American English) an unwanted, extra or unnecessary person: No, I don’t think I’ll join you. Whenever I go out with you guys I just feel like a fifth wheel.
This refers to adding an extra unnecessary wheel to a vehicle.
See also: fifth, third, wheel
Farlex Partner Idioms Dictionary © Farlex 2017

third wheel

n. an extra person; a person who gets in the way. (see also spare tire.) Well, let’s face it. We don’t need you. You are a third wheel.
See also: third, wheel
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
Ypsilanti, MI, July 02, 2015 --(PR.com)-- A group of local filmmakers located in southeast Michigan known as R films Entertainment in collaboration with Quackers Video Productions are set to release their newest short film titled The 3rd Wheel within the next month via YouTube.
The 3rd Wheel was filmed in and around several areas of southeast Michigan.