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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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