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Date: 1300-1400
Language: Middle Dutch
Origin: schum

scum

noun
     
scum
1 [uncountable] an unpleasant dirty substance that forms on the surface of water:
a pond covered with green scum
2 [plural] informal nasty, unpleasant people:
Scum like that should be locked away!
People like that are the scum of the earth.
scummy adjective

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