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English definition of “scum”

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scum

noun
 
 
/skʌm/
SUBSTANCE [U, no plural] an unpleasant, thick substance on the surface of a liquid: There was a thick layer of scum on the water.Coverings and layers
PERSON [U] informal an offensive way of referring to a very bad personUnpleasant people in generalUnpleasant men
(Definition of scum from the Cambridge Learners Dictionary © Cambridge University Press)
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