(construction) A layer of concrete, typically 2 to 6 inches thick, poured below the structural slab but above a layer of wet or muddy soil.

(construction) Surface cracking resembling a dried mud flat.

(literally) A physical fight in which two (or more) opponents wrestle in mud or other dirt. / (figuratively) A dirty duel, involving verbal mudslinging.

plural of mud flap

A flap that hangs down behind a vehicle's wheel so that mud and other things kicked up by the wheel will hit the flap instead of a vehicle behind.

(idiomatic, slang) Refers to a person or a builder using earth, mud, or clay as its main material. / (vulgar, slang) A turd (piece of feces).

Alternative spelling of mudpuppy

The immersion of the body in mud, for therapeutic reasons. / (figuratively) A very muddy area.

plural of mud sedge

(extractive metallurgy) A mixture of solid and metallic oxide-bearing impurities that is a waste product of bauxite refinement. / Used other than figuratively or idiomatically: see red, mud.