Definition of scum in English:

scum

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mass noun

mass noun
  • 1A layer of dirt or froth on the surface of a liquid.

    • ‘green scum found on stagnant pools’
    film, layer, covering, froth, foam, suds, dross, dirt
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  • 2 informal, derogatory A worthless or contemptible person or group of people.

    • ‘you drug dealers are the scum of the earth’
    • ‘he's a better man than any of you scum’
    despicable people, despicable person, rabble, riff-raff, refuse, garbage, trash, vermin, good-for-nothing, good-for-nothings, undesirable, undesirables, the lowest of the low, the dregs of society
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Pronunciation

scum

/skəm/

transitive verbtransitive verb scums, transitive verb scumming, transitive verb scummed

[with object]
  • 1Form a layer of dirt or froth on (a liquid)

    ‘litter scummed the surface of the water’
    • ‘the lake shore was scummed with dead weed’
    1. 1.1no object (of a liquid) become covered with a layer of dirt or froth.
      • ‘the lagoon scummed over’

Pronunciation

scum

/skəm/

Origin

Middle English from Middle Low German, Middle Dutch schūm, of Germanic origin.