Waste material from a mine. / Scum that forms on the surface of molten metal. / Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.

(transitive) To produce slag. / (intransitive) To become slag; to agglomerate when heated below the fusion point. / (transitive) To reduce to slag.

Third-person singular simple present indicative form of slag

plural of slag

simple past tense and past participle of slag

present participle of slag

To purify by melting and removing slag. / (Britain, Ireland, Australia, slang, transitive, idiomatic) To talk insultingly to or about someone or something; usually one who is not present.

plural of slag tag

(UK, derogatory, slang) A tattoo on a woman's lower back.

A man-made mound or heap formed with the waste material (slag) as a by-product of coal mining. Can also refer to the waste by-product from a foundry or furnace, formed into such a mound.