zaseda

1. ambush
   Vojnici su upali u zasedu. — The soldiers fell into an ambush.
   Čekali su ga u zasedi ispred zgrade. — They lay in wait for him outside the building.
2. colloq. (of traffic police) speed trap
   Uspori, posle krivine je policijska zaseda. — Slow down, there's a speed trap after the bend.

Typical phrases: postaviti zasedu (set an ambush), upasti u zasedu (fall into one), čekati u zasedi (lie in wait).