Scum \Scum\, v. t. [imp. & p. p. {Scummed}; p. pr. & vb. n.
{Scumming}.]
1. To take the scum from; to clear off the impure matter from
the surface of; to skim.
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You that scum the molten lead. --Dryden &
Lee.
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2. To sweep or range over the surface of. [Obs.]
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Wandering up and down without certain seat, they
lived by scumming those seas and shores as pirates.
--Milton.
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