1. Be compelled, be necessary, have to, ought to
   "I must take the test before I can drive"; "to pass the exam you must work hard"; "you really must tidy the room some time"

1. A necessary or essential thing
   "seat belts are an absolute must"
    
2. Grape juice before or during fermentation
   "The winemaker carefully monitored the must during the initial stages of fermentation"
    
3. The quality of smelling or tasting old or stale or mouldy
   "The must of the old books filled the library";
   - mustiness, moldiness [N. Amer], mouldiness [Brit, Cdn]
    
4. An annual phase of heightened sexual excitement in the males of certain large mammals (especially elephants); is associated with discharge from a gland between the eye and ear
   "The elephant was in must and had to be separated from the herd";
   - musth

1. Highly recommended
   "a book that is must reading"

Sounds like: muse, mews, Meuse, must, musth, mu

Derived forms: musts, musted, musting

See also: essential

Type of: essential, grape juice, necessary, necessity, phase, requirement, requisite, stage, staleness

Encyclopedia: Must, Richard