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ought

modal verb (DUTY)
 
 
/ɔːt/ US  /ɑːt/

Definition

B1 used to show when it is necessary or would be a good thing to perform the activity referred to by the following verb: [+ to infinitive] You ought to be kinder to him. We ought not/oughtn't to have agreed without knowing what it would cost. "We ought to be getting ready now." "Yes, I suppose we ought (to)."Duty, obligation and responsibility
(Definition of ought modal verb (DUTY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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