Definitions
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noun 
  1. Something that exhibits the property of being stale or musty
  2. Fruit juice that will ferment or has fermented, usually grapes
  3. A time during which male elephants exhibit increased levels of sexual activity and aggressiveness (also musth).
  4. Something that is mandatory or required.
If you'll be out all day, sunscreen is a .
verb (inf=-, must, -, had to, -)
  1. (modal auxiliary verb, defective) The speaker—but not necessarily the subject of the sentence—is certain that the sentence predicate will be executed.
If it rained all day, it be very wet outside.
(Compare with weaker auxiliary verb should, indicating a strong probability of the predicate's execution.)
  1. (modal auxiliary verb, defective) The execution of the sentence predicate is required. (Must usually implies that a negative consequence would otherwise result.)
You arrive to class on time.
(Compare with weaker auxiliary verb should, indicating intent for the predicate's execution.)
  1. (Have two sense: imperative or directive) 'Imperative' creates an obligations, 'directive' defines conditions.
(legalese) Always a directive when used together with apply(application): No one can make you apply for anything.
Etymology: From mosten, past tense of motan, "be able to"


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