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ought

 
 
/ɔːt/ modal verb

Definition

ought to do sth 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?
ought to be/do sth 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.
(Definition of ought modal verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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