Must (mst), v. i. or auxiliary. [OE. moste, a pret. generally meaning,
could, was free to, pres. mot, moot, AS. mste, pret. mt, pres.; akin to
D. moetan to be obliged, OS. mtan to be free, to be obliged, OHG.
muozan, G. müssen to be obliged, Sw. måste must, Goth. gamtan to have
place, have room, to able; of unknown origin.] 1. 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.
2. 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.