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English definition of “a fifth/third wheel”

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a fifth/third wheel

US
someone who is in a situation where they are not needed or are ignored by most people
Translations of “a fifth/third wheel”
in Chinese (Traditional) 冗員,不需要的人, 無足輕重的人…
in Chinese (Simplified) 冗员,不需要的人, 无足轻重的人…
(Definition of a fifth/third wheel from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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