inform/Inˋfɔrm; Inˈfɔːm/v [T] formal to formally tell someone about something【正式】通知﹐告知〔某人〕: inform sb about/of sth No one informed me about the change of plan. 没有人通知我计划有变。She was informed of the accident by the police. 她接到警方通知﹐获悉了这事故。inform sb (that) The college informed me that I had been accepted. 学院通知我﹐我被录取了。inform on/against sbphr v to secretly give information about someone to the police〔向警方〕告发﹐检举