sludge
Sludge (noun) means Thick, soft, semi-liquid mud, waste, or sediment. Example: “The pipe was clogged with a layer of black sludge.”
How to use sludge
Learner’s notesIn plain EnglishThick, gross, semi-liquid gunk, like mud or waste sediment.
Word forms
- Third person singular
- sludges
- Past tense
- sludged
Fill the gap
Can you complete this real example?
The pipe was clogged with a layer of black _____.
Etymology
From Middle English words for mud and mire, ultimately related to the Old English root behind "slush" — sludge and slush share a common muddy ancestor.