unfriend
/ˌʌnˈfrend/verb
with obj.
- informal remove (someone) from a list of friends or contacts on a social networking site〈非正式〉从好友名单中删除（某人）; （在社交网站上）与（某人）中断联系：
she broke up with her boyfriend, but she hasn't unfriended him.
她与男友分手了, 但她并没有中断网上与他的联系。