Meaning of must


A must is something that’s so important it can’t be missed or ignored. When you’re taking kayaking lessons, a lifejacket is a must.

Anything that is required is a must: drinking enough water is a must for being healthy. When you adopt a new dog, making sure he’ll get along with your cat is a must. Another meaning of the noun must is a stale, stuffy smell. Your damp basement and dry, hot attic might both smell of must. This meaning comes from the adjective musty, a variation on the older, now obsolete moisty.

Definitions of must
  1. noun

    a necessary or essential thing

    “seat belts are an absolute

  2. adjective

    highly recommended

    “a book that is
    must reading”


    basic and fundamental
  3. noun

    the quality of smelling or tasting old or stale or mouldy


    moldiness, mustiness

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    type of:


    having lost purity and freshness as a consequence of aging

  4. noun

    grape juice before or during fermentation

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    type of:

    grape juice

    the juice of grapes

Word Family

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