Meaning of scum

scum

Pronunciation: (skum), [key]
— n., v., scummed, scum•ming.
—n.
  1. a film or layer of foul or extraneous matter that forms on the surface of a liquid.
  2. refuse or offscourings.
  3. a low, worthless, or evil person.
  4. such persons collectively; riffraff; dregs.
  5. scoria (def. 1).
—v.t.
  1. to remove the scum from.
  2. to remove as scum.
—v.i.
  1. to form scum; become covered with scum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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