third wheel

[ thurd-weel, hweel ]
See synonyms for third wheel on Thesaurus.com
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.

Origin of third wheel

1
First recorded in 1900–05

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024