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
Examples
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).
Sense 2
Meaning · English
To talk insultingly to or about someone or something; usually one who is not present.
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
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.