Waste material left over after metal is extracted from ore, or used as an insult to demean someone.
From Middle Low German 'slagge' meaning the byproduct of smelting, related to the verb 'slag' (to strike or smash). The term emerged during the medieval mining boom when metalworking expanded across Europe.
Slag is one of the most useful waste products in history—it's been recycled for roads, railroad ballast, and even concrete for centuries, turning what seemed like garbage into infrastructure. It's actually a beautiful example of early industrial recycling that nobody talks about.
In British slang, 'slag' or 'to slag off' carries heavy gendered usage targeting women sexually and morally since mid-20th century, conflating female sexuality with worthlessness.
Use 'criticize,' 'disparage,' or 'reject' when discussing ideas. Avoid when describing people's morality or appearance.
["criticize","disparage","dismiss"]
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