1.[countableC]British EnglishBrE taboo informalSYSEX/HAVE SEX WITH a very offensive word for a woman who has sex with a lot of different people. Do not use this word. 淫妇,荡妇
2.[uncountableU]TI a waste material similar to glass, which remains after metal has been obtained from rock 矿渣,熔渣,炉渣
1slag somebody ↔ offphrasal verbphr vBritish EnglishBrE informalCRITICIZEto criticize someone in an unpleasant way, especially when this is unfair 诋毁,贬损
He’s always slagging her off behind her back.
他老是在背后说她的坏话。
Examples from the Corpus
slag• She wouldn't just dump you and slag you off to your mates.