third wheel

• 3rd wheel (abbreviation)

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third wheel (plural third wheels)

1. (idiomatic) An individual or object that serves no useful purpose.
2. (idiomatic) A third party, usually unwanted, accompanying two people on a date.
3. Used other than figuratively or idiomatically: see third,‎ wheel.

• fifth wheel, gooseberry (British)

• two's company, three's a crowd

third wheel (third-person singular simple present third wheels, present participle third wheeling, simple past and past participle third wheeled)

1. Alternative form of third-wheel.