Must

Must (must) , v. i. o auxiliary

[Old English moste, a pret. generally meaning, could, was free to, pres. mot, moot, Anglo-Saxon mōste, pret. mōt, pres.; akin to Dutch moetan to be obliged, Old Saxon mōtan to be free, to be obliged, Old High German muozan, German mussen to be obliged, Swedish måste must, Gothic gamōtan to have place, have room, to able; of unknown origin.]

To be obliged; to be necessitated; -- expressing either physical or moral necessity; as, a man must eat for nourishment; we must submit to the laws.

To be morally required; to be necessary or essential to a certain quality, character, end, or result; as, he must reconsider the matter; he must have been insane.

Likewise must the deacons be grave. — 1 Tim. iii. 8

Morover, he [a bishop] must have a good report of them which are without. — 1 Tim. iii. 7

The principal verb, if easily supplied by the mind, was formerly often omitted when must was used; as, I must away. “I must to Coventry.” Shak.

Must , noun

[Anglo-Saxon must, from Latin mustum (sc. vinum), from mustus young, new, fresh. Compare Mustard.]

The expressed juice of the grape, or other fruit, before fermentation.

These men ben full of must. — Wyclif (Acts ii. 13.)

No fermenting must fills... the deep vats. — Longfellow

Mustiness.

Must , verb, transitive and intransitive

To make musty; to become musty.

must (must) , adjective

[Hind. mast intoxicated, ruttish, from Sanskrit matta, p.p. of mad to rejoice, intoxicate.]

(Zoology) Being in a condition of dangerous frenzy, usually connected with sexual excitement; -- said of adult male elephants which become so at irregular intervals, typicaly due to increased testosterone levels.

(a)

(Zoology) The condition of frenzy.

(b)

(Zoology) An elephant in must.

Also: musth