To remove the layer of scum from (a liquid etc.). / To remove (something) as scum. / To become covered with scum. / (obsolete) To scour (the land, sea etc.). / (obsolete) To gather together, as scum.

(uncountable) A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).

(printing) The accumulation of sticky ink on a plate. / (chiefly in the plural) That which is scummed off; skimmings; scum.

(video games, derogatory) The strategy of collecting easy rewards in unchallenging areas, e.g. when a high-level character visits levels suitable for low-level characters in roguelike games.

simple past tense and past participle of scum

(chiefly Liverpudlian) The Sun newspaper.

plural of scum

plural of scumming

dominated or plagued by scum.

(informal, derogatory) An undesirable individual; the worst type of person or people.