Definition of “underdog” - English Dictionary

british dictionary

(Definition of “underdog” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“underdog” in American English

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underdognoun [ C ]

us /ˈʌn·dərˌdɔɡ/

the weaker of two competitors, or anyone not expected to win a competition:

He began the race for governor as the underdog.

(Definition of “underdog” from the Cambridge Academic Content Dictionary © Cambridge University Press)