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must

 
Adjective must has 1 sense
  1. must - highly recommended; "a book that is must reading"
    Antonyms:
    inessential, unessential (indirect, via essential)
mussouse mussy must-buy must-do must-have must-read must-see must-use must must mustach mustache mustache mustache cup mustached mustachio mustachioed

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