sludge

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sludge /ˈslʌʤ/ noun
sludge
/ˈslʌʤ/
noun
Learner's definition of SLUDGE
[noncount]
: thick, soft, wet mud
: a soft, thick material that is produced in various industrial processes (such as in the treatment of sewage)
: a thick material that can form in the oil in an engine and cause engine problems

— sludgy

/ˈslʌʤi/ adjective sludgier; sludgiest
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