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slag (n.)
[slag 词源字典]
"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 etymology, slag origin, 英语词源]
slag (v.)
"denigrate," by 1971, from
slag
(n.) in a secondary sense of "worthless person" (1788). Related:
Slagged
;
slagging
.