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Must (v. i. / auxiliary) 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.
Must (v. i. / auxiliary) 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.
Must (n.) The expressed juice of the grape, or other fruit, before fermentation.
Must (n.) Mustiness.
Must (v. t. & i.) To make musty; to become musty.