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Sentence

彼かれは大だい事じなプレゼンでやらかした。

Span Details

大だい事じ

important; serious; crucial

na-adjective, noun

adnominal form of the copula (after a na-adjective or noun)

noun, suru verb

location, means, cause, or scope marker

do something bad; screw up; commit a blunder

-> やらかすgodan verb

past tense or completed action