Definition of "must"
- verb
To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.
To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a negative consequence.
To become musty.
- noun
Something that is mandatory or required.
Fruit juice that will ferment or has fermented, usually grapes.
- Sources