Pronunciation: (must),[key]auxiliary verb. 1. to be obliged or bound to by an imperative requirement: I must keep my word. 2. to be under the necessity to; need to: Animals must eat to live. 3. to be required or compelled to, as by the use or threat of force: You must obey the law. 4. to be compelled to in order to fulfill some need or achieve an aim: We must hurry if we're to arrive on time. 5. to be forced to, as by convention or the requirements of honesty: I must say, that is a lovely hat. 6. to be or feel urged to; ought to: I must buy that book. 7. to be reasonably expected to; is bound to: It must have stopped raining by now. She must be at least 60. 8. to be inevitably certain to; be compelled by nature: Everyone must die.
—v.i. 1. to be obliged; be compelled: Do I have to go? I must, I suppose. 2. Archaic.(sometimes used with ellipsis of go, get, or some similar verb readily understood from the context): We must away.
—adj. necessary; vital: A raincoat is must clothing in this area.
—n. something necessary, vital, or required: This law is a must.
Pronunciation: (must),[key] —n. new wine; the unfermented juice as pressed from the grape or other fruit.
Pronunciation: (must),[key] —n. mold; moldiness; mustiness: a castle harboring the must of centuries.