verb
[modal verb]
a somewhat formal in US English - used to say that something is required or necessary
Note the difference in meaning between must not and not have to.
b - used to say that something is required by a rule or law
somewhat formal in US English - used to say that someone should do something
used to say that something is very likely
used in various phrases to emphasize a statement
somewhat formal in US English - used in questions that express annoyance or anger
if you must
used to say that you will allow someone to do something even though you do not approve of it
if you must know
noun
plural musts
[count] :something that is or seems to be required or necessary - usually singular