must

• mus'

• (stressed) IPA^(key): /mʌst/
• (unstressed) IPA^(key): /məs(t)/

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• Rhymes: -ʌst
• Homophone: mussed

From Middle English moste ("must", literally, "had to", the past tense of Middle English moten (“to have 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 måste (“must, have to, be obliged to”). More at mote.

must (third-person singular simple present must, present participle -, simple past must, past participle -)

1. (modal auxiliary, defective) To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate.

   If it has rained all day, it must be very wet outside.

   You picked one of two, and it wasn't the first: it must have been the second.

2. (modal auxiliary, defective) To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a negative consequence.

   You must arrive in class on time. — the requirement is an imperative

   This door handle must be rotated fully. — the requirement is a directive

   Arise, and go into the city, and it shall be told thee what thou must do. (Bible, Acts 9:6)

3. (modal auxiliary, defective) said about something that is very likely, probable, or certain to be true

   The children must be asleep by now.

• (auxiliary, to do with certainty): Compare with weaker auxiliary verb should, indicating a strong probability of the predicate's execution.
• (auxiliary, to do as a requirement): Compare with weaker auxiliary verb should, indicating mere intent for the predicate's execution; and stronger auxiliary verb will, indicating that the negative consequence will be unusually severe.
• The past tense of "must" is also "must". In main clauses, this use of the past tense is almost always literary (see Bible and Fritz Leiber quotations below). In subordinate clauses, it is more common: He knew what he must do. Otherwise, the past sense is usually conveyed by had to. It is possible to use be bound to for the past also. For this reason, have to and be bound to are also used as alternatives to must in the present and future.
• The principal verb, if easily supplied, may be omitted. In modern usage this is mainly literary (see Housman and Tolkien quotations below).
• Must is unusual in its negation. Must not still expresses a definite certainty or requirement, with the predicate negated, it's the synonym of cannot. Need, on the other hand, is negated in the usual manner. Compare:

You must not read that book. (It is necessary that you not read that book.)

You need not read that book. (It is not necessary that you read that book.)

• The second-person singular (thou being the subject) no longer adds -est (as it did in Old English).

• 1611, The Holy Bible, […] (King James Version), imprinted at London: By Robert Barker, […], OCLC 964384981, Genesis 47:29:

  And the time drew nigh that Israel must die, and he called his sonne Ioseph, and said vnto him, If now I haue found grace in thy sight, put, I pray thee, thy hand vnder my thigh, and deale kindly and truely with mee, bury me not, I pray thee, in Egypt.

• 1936, Alfred Edward Housman, More Poems, IX, lines 3-6

  Forth I wander, forth I must,

  And drink of life again.

  Forth I must by hedgerow bowers

  To look at the leaves uncurled

• 1937 J.R.R. Tolkien, The Hobbit

  We must away ere break of day

  To seek the pale enchanted gold.

• 1968 Fritz Leiber, Swords in the Mist

  Whereupon while one patched or napped, the other must stand guard against inquisitive two- and three-headed dragons and even an occasional monocephalic.

• Appendix:English modal verbs
• Appendix:English tag questions

must (plural musts)

1. Something that is mandatory or required.

   If you'll be out all day, a map is a must.

• imperative

• no-no

From Middle English must, from Old English must and Old French must, most, both from Latin mustum.

must (plural musts)

1. The property of being stale or musty.
2. Something that exhibits the property of being stale or musty.
3. Fruit juice that will ferment or has fermented, usually grapes.
   • Henry Wadsworth Longfellow:

     No sweet grape lies hidden here in the shade of its vine-leaves,

     No fermenting must fills and o'erflows the deep vats.

must (third-person singular simple present musts, present participle musting, simple past and past participle musted)

1. (transitive) To make musty.
2. (intransitive) To become musty.

• must on Wikipedia.Wikipedia

Persian مست‎ (mast, “drunk, inebriated”), from Middle Persian 𐭬𐭮𐭲‎ (mast).

must (plural musts)

1. A time during which male elephants exhibit increased levels of sexual activity and aggressiveness (also spelled musth).
   • 1936, George Orwell, Shooting an Elephant, an essay in the magazine New Writing:

     It was not, of course, a wild elephant, but a tame one which had gone ‘must’.

2. An elephant in this sexual and aggressive state.

• MTUs, UMTS, UTMS, smut, stum, tums

• IPA^(key): /mʏst/

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must m (uncountable)

1. necessity, prerequisite

   Een rijbewijs is een must als je taxichauffeur wil worden.

   A driver's license is a necessity if you want to be a taxi driver.

From Proto-Finnic *musta.

must (genitive musta, partitive musta)

1. black (color)
2. dirty, unclean

• must auk
• mustvalge

A variant of musta < minusta (“of me”).

must

1. (colloquial, eye dialect) Elative singular form of mä.

   Must' on tärkeetä, että.. / Minusta on tärkeää, että... (standard)

   I think it is important that...

Borrowed from English must.

• IPA^(key): [ˈmɑst]

must

1. (colloquial) must (something mandatory or required)

   Se on ihan must!

   It's a must!

• Not inflected.

• pakko; pakollinen juttu

Borrowed from English must.

must m (plural musts)

1. (informal) that which is compulsory; an obligation; duty; must

• IPA^(key): [ˈmuʃt]
• Hyphenation: must

must (plural mustok)

1. must (sweet fresh grape juice that has not fermented yet)

From Proto-Finnic *musta.

must

1. black

From Latin mustum, from Proto-Indo-European *mus-, *mews- (“damp”).

must n (plural musturi)

1. unfermented wine; grape or other fruit juice
2. must (of grapes)

• mustos
• mustăreață

• zeamă, suc

From Old Norse muster, moster, from Latin mustum.

• IPA^(key): /mɵst/

must c (uncountable)

1. A kind of soft drink, more commonly known as julmust
2. Unfermented fruit juice

• must on the Swedish Wikipedia.Wikipedia ^sv

From Proto-Finnic *musta.

must

1. black

• musteta
• Mustmägi
• mustsil'mäine
• mustverine

must

1. black

• Zajceva, N. G.; Mullonen, M. I. (2007), “чёрный”, in Uz’ venä-vepsläine vajehnik / Novyj russko-vepsskij slovarʹ [New Russian–Veps Dictionary], Petrozavodsk: Periodika

must (plural musts)

1. must (new wine; sweet cider)

From Proto-Finnic *musta.

must (genitive musta, partitive musta)

1. black (colour)