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countable and uncountable, plural sludges
Solids separated from suspension in a liquid. quotations examples
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
A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes. examples
A sediment of accumulated minerals in a steam boiler. examples
A mass of small pieces of ice on the surface of a water body. examples
(uncountable, music) sludge metal examples
third-person singular simple present sludges, present participle sludging, simple past and past participle sludged
(intransitive, informal) To slump or slouch. examples
(intransitive) To slop or drip slowly. examples