sludge meaning: definition, etymology and quotations

sludge

nounalso spelled SLUDGE

/slʌd͡ʒ/

Etymology From Middle English slugge, sluche (“mud, mire”), probably an alteration of Middle English sliche, slicche ("mud, slush, tar"; whence Modern English slitch), from Old English *sliċ, from Proto-West Germanic *sliki, *slīk, from Proto-Germanic *slikiz, *slīką (“mud, slush”). Cognate with Dutch slijk, German Schlick. Compare also slush.

1

Solids separated from suspension in a liquid.

Floods in northern India, mostly in the small state of Uttarakhand, have wrought disaster on an enormous scale.[…]Rock-filled torrents smashed vehicles and homes, burying victims under rubble and sludge.2013 June 29, “High and wet”, in The Economist, volume 407, number 8842, page 28:

2

A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes.

3

A sediment of accumulated minerals in a steam boiler.

4

A mass of small pieces of ice on the surface of a water body.

5

Entertainment, Lifestyle, Music Abbreviation, Ellipsis Ellipsis of sludge metal.

6

Institutional policies that introduce tedium and inefficiency in processes.

Behavioral science

In the 2008 best seller Nudge, the legal scholar Cass R. Sunstein and the economist Richard H. Thaler marshaled behavioral-science research to show how small tweaks could help us make better choices. An updated version of the book includes a section on what they called “sludge”—tortuous administrative demands, endless wait times, and excessive procedural fuss that impede us in our lives.[2025 June 29, Chris Colin, “That Dropped Call With Customer Service? It Was on Purpose.”, in The Atlantic, retrieved 29 Jun 2025, Ideas:

Synonyms: mire, mud, ooze, slush
Derived terms: activated sludge, antisludge, biliary sludge, biosludge, desludge, mudge, oil sludge, primordial sludge, sludge acid, sludgecore, sludge hole, sludgelike, sludgemaker, sludge metal, sludge out, sludger, sludgy

sludge

verb

Etymology From Middle English slugge, sluche (“mud, mire”), probably an alteration of Middle English sliche, slicche ("mud, slush, tar"; whence Modern English slitch), from Old English *sliċ, from Proto-West Germanic *sliki, *slīk, from Proto-Germanic *slikiz, *slīką (“mud, slush”). Cognate with Dutch slijk, German Schlick. Compare also slush.

1

Informal To slump or slouch.

2

To slop or drip slowly.

SLUDGE

noun

1

Emergency medicine, Medicine, Sciences Mnemonic An acronym used to help remember the common symptoms of certain affections of a cholinergic toxidrome: salivation, lacrimation, urination, defecation, gastrointestinal upset, emesis.

Synonyms: DUMBELS