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English definition of “slag”

slag

noun [U] uk   /slæɡ/ us  

slag noun [U] (WASTE)

[U] waste material produced when coal is dug from the ground, or a substance produced by mixing chemicals with metal that has been heated until it is liquid in order to remove unwanted substances from it
See also
Rubbish and wasteEnvironmental issues

slag noun [U] (WOMAN)

[C] UK slang disapproving a woman who people disapprove of because she has had a lot of sexual partnersPeople who sell sex or are promiscuous

slag noun [U] (LIQUID)

[U] Australian English informal for spit nounBodily fluids and their productionUrine and urinating
(Definition of slag from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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