must

definition: highly recommended
example:
speech part: adjective
synonyms:
definition: the quality of smelling or tasting old or stale or mouldy
example:
speech part: noun
synonyms: mustiness
definition: grape juice before or during fermentation
example:
speech part: noun
synonyms:
definition: a necessary or essential thing
example: seat belts are an absolute must
speech part: noun
synonyms:

must is explained and pronounced

How must is being used?