VERB
大批杀死;大量毁灭
To decimate something such as a group of people or animals means to destroy a very large number of them.
例句
The pollution could decimate the river's thriving population of kingfishers...
污染可能会造成河边大量繁殖的翠鸟大批死亡。
British forces in the Caribbean were being decimated by disease.
加勒比海地区的英国部队有大批的人病死。