暗中警告,私下告誡,密報(尤指非法的事情)
tip sb off (about sth)
to warn sb about sth that is going to happen, especially sth illegal
Three men were arrested after police were tipped off about the raid.警方獲得有關襲擊的密報後,逮捕了三個人。
釋義來自《牛津高階英漢雙解詞典》第 9 版