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English definition of “blunder”

blunder

noun [C] uk   /ˈblʌn.dər/ us    /-dɚ/
a serious mistake, usually caused by not taking care or thinking: He said that the tax was a major political blunder. I made a bit of a blunder by getting his name wrong.Faults and mistakes

blunder

verb uk   /ˈblʌn.dər/ us    /-dɚ/

blunder verb (MOVE)

[I usually + adv/prep] to move in an awkward way: I could hear him blundering around in the darkness.Moving unsteadily or with difficulty

blunder verb (MISTAKE)

[I] to make a serious mistake, usually because of not taking care or thinking: Police blundered by not releasing more details about the case to focus public interest.Making mistakes
blunderer
noun [C] uk   /r/ us    //
Stupid and silly people
blundering
adjective [before noun] uk   /-ɪŋ/ us  
You blundering idiot! What do you think you're doing?Inability and awkwardness
(Definition of blunder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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