n. something that someone ought to do. : Seeing the Eiffel tower is a must do in Paris. , Tell me some of the “musts” in southern Utah.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases
muster
In addition to the idiom beginning with muster, also see pass muster.
