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