Must is the thick goo of grape skins, pulp, seeds, and juice that is the end product of sending whole grape clusters through a "crusher-destemmer" machine. It is the start of the actual wine-making process. It is the must that is placed into fermenters to begin primary fermentation.
The mixture of unfermented juice and crushed grapes that results from crushing, and typically destemming, fresh grapes. For red wines, one typically ferments the must and then presses out the new wine. For white wines, one typically presses the must and then ferments only the juice.
Being in a condition of dangerous frenzy, usually connected with sexual excitement; -- said of adult male elephants which become so at irregular intervals, typicaly due to increased testosterone levels.
In this specification, the word "must" is to be interpreted as a mandatory requirement on the implementation or on Strictly Conforming XHTML Documents, depending upon the context. The term "shall" has the same definition as "must".