slagged off meaning in English

排渣；很强烈地批评

mark's always slagging off his friends behind their backs
马克老是在背后诋毁他的朋友。
now he's left, she's always slagging off her old boss
因原老板已走了,她就一个劲儿地褒贬他
city fans are the best in the country-they always get behind their team and have never ever slagged off a player in a blue shirt during a game
曼城球迷是全国最好的，他们总是跟随着球队而且在比赛中从不辱骂穿蓝色队服的球员。
acetylene generator adopts low pressure water submerged calcium carbide process and is equipped with automatic slagging off and water replenishing device which ensures high reliability and safety standard
乙炔发出器采用电石入水低压式，设有自动排渣和自动加水装置，设备安全可靠。