One who, or that which, mulls.

(art) A grinding stone, held in the hand, used especially for preparing paints and powders.

A vessel in which wine, etc., is mulled over a fire.

(metallurgy) A machine that mixes sand and clay for use in metal castings.

To grind up into, or as if into, powder.

(transitive, UK, slang) To beat; to thrash (a person).

(transitive, UK, slang) To defeat or destroy utterly (as in a sport or competition).