Definition of "scum"
noun:
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A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).
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A greenish water vegetation (such as algae), usually found floating on the surface of ponds.
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The topmost liquid layer of a cesspool or septic tank.
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A reprehensible person or persons.
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verb:
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To remove the layer of scum from (a liquid etc.).
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To remove (something) as scum.
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