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must

/mʌst/
verb
  1. Used to express necessity or obligation.
    • Everyone must follow the safety rules in the laboratory.
    • You must finish your homework before you can play outside.
    • We must leave now to catch the train.
  2. Used to express strong probability or certainty.
    • She must be tired after running that far.
    • That must be the package I ordered.
    • You must have forgotten your keys at home.
  3. Used to express a recommendation or insistence.
    • You must see that movie — it's amazing.
    • This book is a must-read for anyone interested in history.
    • You must try the chocolate cake; it's delicious.
Synonyms
shouldneed
Antonyms
may
noun
  1. Something that is necessary or very important.
    • Warm clothes are a must for a winter trip to the mountains.
    • A good dictionary is a must for any writer.
    • This app is a must for learning new languages.
Synonyms
necessityessential
Antonyms
optional
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