MUST (2)

must (2). Must, v. to make or grow moldy; n. new wine or wort

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Must, n. [[AS. must, fr. L. mustum (sc. vinum), from mustus young, new, fresh. Cf. Mustard.]] 1. 1. 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. 2. 2. [[Cf. Musty.]] Mustiness.