[mass noun]stony waste matter separated from metals during the smelting or refining of ore 矿渣,炉渣,熔渣 ■similar material produced by a volcano; scoria 火山渣
(Brit. informal, derogatory)a promiscuous woman (英,非正式,贬)性乱交的女子 ■a contemptible or insignificant person 卑鄙小人;无足轻重的人
(slagged, slagging)
[no obj.][usu. as noun slagging]produce deposits of slag 成渣
[with obj.](Brit. informal)criticize (someone) in an abusive and insulting manner (英,非正式)辱骂;侮辱(某人) we used to hate each other and slag each other off. 我们过去相互憎恨,经常相互辱骂。
mid 16th cent.: from Middle Low German slagge, perhaps from slagen 'strike', with reference to fragments formed by hammering. The verb sense 'criticize' dates from the 1970s