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English definition of “scum”

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scum

noun uk   /skʌm/ us  

scum noun (DIRT)

[U] 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.

scum noun (IMMORAL PERSON)

[C or U] ( plural scum) informal a very bad or immoral person or group of people: People who organize dog fights are scum in my opinion! His boss treats him like scum (= very badly). racist scum
scummy
adjective uk   /ˈskʌm.i/ us  
(Definition of scum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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