Usually means: Should not; indicates prohibition, advisability.
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We found 9 dictionaries that define the word oughtn't:

General (9 matching dictionaries)
  1. oughtn't: Merriam-Webster
  2. oughtn't: Oxford Learner's Dictionaries
  3. oughtn't, oughtn't: Collins English Dictionary
  4. Oughtn't, oughtn't, oughtnt: Wordnik
  5. oughtn't: Cambridge Advanced Learner's Dictionary
  6. oughtn't: Wiktionary
  7. oughtn't: Webster's New World College Dictionary, 4th Ed.
  8. oughtn't: The Wordsmyth English Dictionary-Thesaurus
  9. oughtn't, oughtnt: Dictionary.com

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Definitions from Wiktionary (oughtn't)

▸ verb:  (UK, Ireland, Commonwealth) (US, Philippines, dated, rare) ought not (negative auxiliary).


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