Meaning of “the odd one out” in the English Dictionary

british dictionary

"the odd one out" in British English

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the odd one out

also the odd man out UK

a person or thing that is different from or kept apart from others that form a group or set:

Guess which number of the following sequence is the odd one out.
She was always the odd one out at school - she didn't have many friends.

(Definition of “the odd one out” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)