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English definition of “must”

must

modal verb (BE NECESSARY)   /mʌst, məst/ (must)
used to show that it is necessary or important that something happen in the present or future : Seeing what others have and she lacks , she believes that she must have more. We must not surprise them (= it is wrong , dangerous , or forbidden ). If you say that you must do something, you can mean that you have a firm intention to do something in the future : I must call my sister later . Must is sometimes used for emphasis : I must admit I enjoy these movies .
(Definition of must modal verb (BE NECESSARY) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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