English Dictionary

slag off

verb

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.

He used a furnace to slag off the impurities from the metal.

意味（1）

To purify by melting and removing slag.

There is a lot of copper oxide, but I can remove that by melting everything and slagging it off.

意味（2）

(Britain, Ireland, Australia, slang, transitive, idiomatic) To talk insultingly to or about someone or something; usually one who is not present.