Etymology
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slag (n.)

"refuse from smelting," 1550s, from Middle Low German slagge (German Schlacke) "splinter flying off when metal is struck," related to Old High German slahan "to strike, slay" (see slay (v.)).

slag (v.)

"denigrate," by 1971, from slag (n.) in a secondary sense of "worthless person" (1788). Related: Slagged; slagging.

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Definitions of slag
1
slag (v.)
convert into slag;
2
slag (n.)
the scum formed by oxidation at the surface of molten metals;
Synonyms: scoria / dross
From wordnet.princeton.edu