Definition of “blunder” - 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/
blunderer
noun [ C ] uk /ˈblʌn.də.rər/ us /ˈblʌn.dɚ.ɚ/
blundering
adjective [ before noun ] uk /ˈblʌn.də.rɪŋ/ us /ˈblʌn.dɚ.ɪŋ/

You blundering idiot! What do you think you're doing?

(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)