Must Definition

mŭst
verb
To be obliged or required by morality, law, or custom.
Citizens must register in order to vote.
American Heritage
To be compelled, as by a physical necessity or requirement.
Plants must have oxygen in order to live.
American Heritage

Used elliptically in the same functions as must.

Shoot if you must.
Webster's New World
To be determined to; have as a fixed resolve.
If you must leave, do it quietly.
American Heritage
Used to indicate inevitability or certainty.
We all must die.
American Heritage
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noun
Something that must be done, had, read, seen, etc.
This book is a must.
Webster's New World
Something that is absolutely required or indispensable.
Promptness on the job is a must. Comfortable boots are a must when going on a hike.
American Heritage
A state of frenzy in animals, esp. in the male elephant, usually associated with sexual heat.
Webster's New World
A musty quality or state; mustiness.
Webster's New World
The juice pressed from grapes or other fruit before it has fermented; new wine.
Webster's New World
Antonyms:
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adjective
That must be done, etc.; necessary; essential.
A book that is must reading.
Webster's New World
In must.
Webster's New World

Other Word Forms of Must

Noun

Singular:
must
Plural:
musts

Origin of Must

  • From Middle English moste (“must", literally “had to"), from Old English mōste (“had to"), 1st & 3rd person singular past tense of mōtan (“to be allowed, be able to, have the opportunity to, be compelled to, must, may"). Cognate with Dutch moest (“had to"), German musste (“had to"), Swedish mÃ¥ste (“must, have to, be obliged to"). More at mote.

    From Wiktionary

  • Middle English moste from Old English mōste past tense of mōtan to be allowed med- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English from Old English from Latin mustum from neuter of mustus new, fresh

    From American Heritage Dictionary of the English Language, 5th Edition

  • Persian مست (mast, “drunk, inebriated"), from Middle Persian 𐭬𐭮𐭲 (mast).

    From Wiktionary

  • Scottish from Old French variant of musc musk

    From American Heritage Dictionary of the English Language, 5th Edition

  • Old French must, most, from Latin mustum

    From Wiktionary

  • Probably back-formation from musty

    From American Heritage Dictionary of the English Language, 5th Edition

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