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scum

noun

  1. a thin layer of impurities which forms on the top of liquids or bodies of water, often as the result of boiling or fermentation
  2. the dross or refuse on top of molten metals
  3. worthless parts or things; refuse
  4. Informal a low, despicable person, or such people collectively; lowlife

transitive verb scummed, scumming

to remove scum from; skim

intransitive verb

to form scum; become covered with scum

See scum in American Heritage Dictionary 4

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