tip off
英['tɪpɒf] 美['tɪpˌɔːfˌ-ˌɑːf]
"He tipped off the police about the terrorist plot"
1.给…通风报信;暗中告知
If someonetips youoff, they give you information about something that has happened or is going to happen.
e.g. Greg tipped policeoff on his car phone about a suspect drunk driver...
格雷格用他的汽车电话向警方报告了一个有酒后驾驶嫌疑的司机。
e.g. He was arrested two days later after a friend tippedoff the FBI.
他的一个朋友给美国联邦调查局报了信两天以后他就被捕了。
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