1 B2 习语 非正式
秘密警告某人或给某人内部消息,尤其是帮助对方避开麻烦或抓住别人。
"An anonymous caller tipped off the police about the planned robbery."
“
A hotel cleaner tipped off immigration officials after finding false passports in a guest's room.
— Common news report phrasing; widely attested in UK press.
可分离