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

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

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
References in periodicals archive ?
purchase of complete fire compartment vessels with integrated 3rd wheel and tag (vessels including standard lock, Standard wheel, Associated axle, Mounting parts, T-leg, Partition) and flylock for insertion.
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.