Must
MUST, verb intransitive
1. To be obliged; to be necessitated. It expresses both physical and moral necessity. A man must eat for nourishment, and he must sleep for refreshment. We must submit to the laws or be exposed to punishment. A bill in a legislative body must have three readings before it can pass to be enacted.
2. It expresses moral fitness or propriety, as necessary or essential to the character or end proposed. 'Deacons must be grave, ' 'a bishop must have a good report of them that are without.' 1 Timothy 3:2.
MUST, noun [Latin mustum; Heb. to ferment.]
New wine; wine pressed from the grape but not fermented.
MUST, verb transitive To make moldy and sour.
MUST, verb intransitive To grow moldy and sour; to contract a fetid smell.