Definitions from Wiktionary (sludge)

▸ noun:  Solids separated from suspension in a liquid.
▸ noun:  A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes.
▸ noun:  A sediment of accumulated minerals in a steam boiler.
▸ noun:  A mass of small pieces of ice on the surface of a water body.
▸ verb:  (intransitive, informal) To slump or slouch.
▸ verb:  (intransitive) To slop or drip slowly.
▸ noun:  (emergency medicine, mnemonic) An acronym used to help remember the common symptoms of certain affections of a cholinergic toxidrome: "salivation, lacrimation, urination, defecation, gastrointestinal upset, emesis".
▸ noun:  (uncountable, music) Ellipsis of sludge metal. [An abrasive, distorted subgenre of heavy metal music influenced by hardcore punk and doom metal.]

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