slag off
动词 v.
英文释义
动词 v.
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To purify by melting and removing slag.
— There is a lot of copper oxide, but I can remove that by melting everything and slagging it off.
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To talk insultingly to or about someone or something; usually one who is not present.
— I am forever slagging off some poor harmless dude or pitiful demented twitcher[.]
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数据来源: Wiktionary