Meaning of “ought to” in the English Dictionary

"ought to" in British English

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ought tomodal verb

uk /ˈɔːt ˌtə/ us /ˈɑːt ˌtə /

ought to modal verb (DUTY)

B1 used to show when it is necessary or would be a good thing to perform the activity referred to by the following verb:

[ + 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 guess we ought (to)."

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ought to modal verb (PROBABLE)

B2 used to express something that you expect will happen:

He ought to be home by seven o'clock.
They ought to have arrived at lunchtime but the flight was delayed.
If you show the receipt, there ought not to be any difficulty getting your money back.

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(Definition of “ought to” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)