“卧底”在英语里怎么说

卧底

[词典] dinting; caunch(e); foot-ridding; brushing; [电影] Interlligencer;

[例句]记者通知了警方，后者于是为诱捕史密斯而安插了一名卧底侦探。

Journalists informed police who planted an undercover detective to trap Smith.