挖墙角 [词典] undermine the foundation; [例句]然而时过境迁,炫耀财富的心理开始挖墙角了。But there is was; the pride of riches was beginning its disintegrating work.
墙角通常两层含义:抢了他人的女/男朋友,英语里是steal one's GF/BF,挖走了是steal away,再挖回来是steal back