A Quick and Simple Dictionary

must

1. Verb.  (context, modal) to do with certainty; (non-gloss definition, indicates that the speaker is certain that the subject will have executed the predicate) .
2. Verb.  (context, modal) to do as a requirement; (non-gloss definition, 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) .
3. Noun.  Something that is mandatory or required.
4. Noun.  Something that exhibits the property of being stale or musty.
5. Noun.  Fruit juice that will ferment or has fermented, usually grapes.
6. Noun.  A time during which male elephants exhibit increased levels of sexual activity and aggressiveness ''(also musth)''.