Meaning of “blunder” in the English Dictionary

"blunder" in British English

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blundernoun [ C ]

uk /ˈblʌn.dər/ us /ˈblʌn.dɚ/

blunderverb

uk /ˈblʌn.dər/ us /ˈblʌn.dɚ/

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

"blunder" in American English

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blundernoun [ C ]

us /ˈblʌn·dər/

a big mistake, especially one resulting from a lack of care or thought:

His failure to respond immediately to the accusations was a major political blunder.
blunder
verb [ I ] us /ˈblʌn·dər/

He feared he had blundered.

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