verb · To enter or leave a country illegally or secretly, often by crossing a border clandestinely or as a stowaway on a ship.

他企图躲在货柜里偷渡出境，但被海关发现了。

verb · To secretly pass through a military or naval blockade without authorization.

这艘快艇试图在深夜偷渡敌方的海上封锁线。