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English definition of “ought”

ought

modal verb     /ɔːt/
ought to do sth B1 used to say or ask what is the correct or best thing to do: We ought to tidy up before we go. You ought to see a doctor . He ought to have told her the truth . Ought I to phone her?Duty, obligation and responsibility
ought to be/do sth B2 used to say that you expect something to be true or that you expect something to happen : She ought to be home by seven. He ought to pass the exam this time . Possible and probable
(Definition of ought modal verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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