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English definition of “must”

must

modal verb (NECESSARY)    strong /mʌst/ weak /məst/ /məs/
A2 used to show that it is necessary or very important that something happens in the present or future : Meat must be cooked thoroughly . I must get some sleep . You mustn't show this letter to anyone else . Luggage must not be left unattended (= it is against the rules ).formal Must you leave so soon ?formal "Must I sign this?" "Yes, you must."Essential or necessary If you say that you must do something, you mean that you strongly intend to do something in the future : I must phone my sister . We must get someone to fix that wheel . I mustn't bite my nails .Planning, expecting and arrangingPlotting and trapping used for emphasis : I must say, you're looking extremely well. I must admit , I wasn't looking forward to it.Very and extremeComplete and wholeIntensifying expressions B1 If you tell someone else that they must do something pleasant , you are emphasizing that you think it is a good idea to do that: You must come and stay with us for the weekend . We must meet for lunch soon .Encouraging and urging onInspiration and inspiring Grammar:MustGrammar:Must: formsGrammar:Must: usesGrammar:Must and have (got) to?Grammar:Must: typical errors
(Definition of must modal verb (NECESSARY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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