N-UNCOUNT
背后说别人的坏话;背后毁谤
If you accuse someone of backbiting, you mean that they say unpleasant or unkind things about someone who is not present, especially in order to stop them doing well at work.
例句
Corporate backbiting is nothing new.
在公司里,背后说人坏话并非什么新鲜事。