To exterminate a group of people or animals means to kill all of them.
例句
A huge effort was made to exterminate the rats...灭鼠花了大力气。They have a real fear that they'll be exterminated in the ongoing civil war...他们十分害怕自己会在持续的内战中被彻底消灭。
英英词典释义
Noun
1. complete annihilation;
"they think a meteor cause the extinction of the dinosaurs"