(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.

plural of scumming

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

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.

simple past tense and past participle of scum

plural of scum

(chiefly Liverpudlian) The Sun newspaper.

Algae, especially when growing on the surface of a pond. / Worthless, insignificant person or people.

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