I hate the way he's always slagging off his colleagues.

他老损他的同事，我看不惯。

《牛津词典》

It can be used for various aluminum alloys. Casting may be made immediately after degassing and slagging off.

用于各种铝合金，除气后迅速扒渣，即可浇铸。

youdao

He was standing up for British teenagers saying that they're inspirational, not slagging off politicians or the media.

他正在站立在对于说他们是带有灵感的英国青少年上面，不在政客或媒体外使成渣。

youdao

What I'm doing is not slagging off, I'm saying I'm looking for someone who can unite our party and who can lead our party with exciting new radical ideas and I believe that the person who can do that best is Iain Duncan Smith.

BBC: News | BREAKFAST WITH FROST | The former Conservative Chairman, Michael Ancram, told Breakfast with Frost that a Kenneth Clarke leadership victory risks tearing the Party apart

The conversation moved on to those intense days of war almost 15 years back and we did what any member of the journalist tribe does when gathering after many years apart - slagging off the louder mutual acquaintances and wondering what ever happened to the quiet ones.

BBC: A classic tale of a life made good in America