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English definition of “ought”

ought

modal verb [+ to infinitive] (PROBABLE)   /ɔt/ (present tense ought)
used to say that the action expressed in the verb is probable or expected: He ought to be home by seven o’clock. The curtains ought to be ready on Monday. At his age, he ought to have known better.
(Definition of ought modal verb (PROBABLE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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