to move very quickly and easily through the air, especially down from a high position in order to attack

The eagle swooped down to snatch a young rabbit. 鹰俯冲下来抓一只小兔子。

to make a sudden attack on a place or group of people in order to surround and catch them

Undercover police swooped on three houses in the city at 5.00 this morning. 今天早上5点，便衣警察突击搜查了城里的三栋房子。