Meaning of “scum” in the English Dictionary

(Definition of “scum” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"scum" in American English

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scumnoun [ U ]

us /skʌm/

a thin layer that forms on the surface of a liquid:

The tea was nasty-tasting stuff that looked like pond scum.
I wish you wouldn’t leave soap scum in the bathtub.

(Definition of “scum” from the Cambridge Academic Content Dictionary © Cambridge University Press)