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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 from the Cambridge Learners Dictionary © Cambridge University Press)
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