打招呼dǎ zhāo·hu 1.用语言或动作表示问候{(by words or gestures) greet sb.; say hello}: 路上碰见熟人,打了个招呼。{I met an acquaintance on the way and greeted him.} 2.(事前或事后)就某项事情或某种问题予以通知、关照{notify; let sb. in on sth. (beforehand or afterwards)}: 已经给你们打过招呼,怎么还要这样干?{I already informed you, now why did you still do it in this way?}