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ought

modal verb (PROBABLE)
 
 
/ɔːt/ US  /ɑːt/

Definition

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/oughtn't to be any difficulty getting your money back.Possible and probable
(Definition of ought modal verb (PROBABLE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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