to suddenly attack someone after hiding and waiting for them:
Five soldiers died after their bus was ambushed on a country road.
He was ambushed by gunmen on his way to work.
noun
/ˈæm.bʊʃ/
the act of hiding and waiting for sb and then making a surprise attack on them 伏击；埋伏
Two soldiers were killed in a terrorist ambush.
两名士兵遭到恐怖分子伏击而死亡。
They were lying in ambush, waiting for the aid convoy.
他们埋伏起来，等着袭击援助车队。