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scum noun

  /skʌm/
  • (uncountable) A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).
на́кипь, нечисто́ты, пе́на
  • (derogatory, slang) A reprehensible person or persons.
не́чисть, негодя́й, отре́бье, отро́дье, подле́ц, сброд
  • (uncountable) A greenish water vegetation (such as algae), usually found floating on the surface of ponds
ти́на

scumming

вспенивание
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