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English definition of “scum”

scum

noun [U] (DIRT)    /skʌm/
a layer of unpleasant or unwanted material that has formed on the top of a liquid: The lake near the factory was covered with grey, foul-smelling scum.Rubbish and wasteEnvironmental issues scummy     /ˈskʌm.i/ adjective Dirty and untidy
(Definition of scum noun (DIRT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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