Meaning of “oughtn't” in the English Dictionary

british dictionary

"oughtn't" in British English

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oughtn't

uk /ˈɔː.tənt/ us /ˈɑː.tənt/

UK or US old-fashioned short form of ought not:

He oughtn't to do that.

(Definition of “oughtn't” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)