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third wheel

American  
[thurd weel, hweel] / ˈθɜrd ˈwil, ˈʰwil /

noun

  1. a person or thing that does not belong or is not wanted or needed.

    When my wife’s sister is here the two of them talk up a storm, and I feel like a third wheel.

Etymology

Origin of third wheel

First recorded in 1900–05

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.