scum

Noun
  1. Worthless people (synset 108419104)
    is a type of: rabble, ragtag, ragtag and bobtail, riffraff - disparaging terms for the common people
    same as: trash
  2. A film of impurities or vegetation that can form on the surface of a liquid (synset 104164764)
    is a type of: film - a thin coating or layer
    subtypes: dross, scoria, slag - the scum formed by oxidation at the surface of molten metals
Verb
  1. Remove the scum from (synset 202371350)
    is a type of: get rid of, remove - dispose of

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