tipsboff
—phrasal verbwithtipverbuk/tɪp/us/tɪp/-pp-
C2
towarnsomeone secretly about something that willhappen, so that they can takeactionorpreventit fromhappening
向（某人）告密；给（某人）通风报信
[+ that]Somebody must havetippedtheburglarsoffthatthehousewould beempty.一定是有人给盗贼通风报信，告诉他们房子里到时候会没有人。
Therobberwascaughtwhen someonetippedoff thepolice.有人向警方报信后，抢劫者即被抓获。