English · Phrasal verb Attested

slag off

In real, traceable use. Part of the curated seed collection; community review is coming.

Sense 1

Meaning · English

To purify by melting and removing slag.

Where it’s used: Used American English

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

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Meaning · English

To talk insultingly to or about someone or something; usually one who is not present.

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

What does “slag off” mean?

To purify by melting and removing slag.

Is “slag off” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.

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