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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:MustSee moreGrammar:Must: formsSee moreGrammar:Must: usesSee moreGrammar:Must and have (got) to?See moreGrammar:Must: typical errorsSee more
(Definition of must modal verb (NECESSARY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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