【考研英语】have them by the throat在这句话中是什么意思啊

题目

【考研英语】have them by the throat在这句话中是什么意思啊
But many shippers complain that for heavy bulk commodities traveling long distances,such as coal,chemicals,and grain,trucking is too costly and the railroads therefore have them by the throat.
如题,这句话中have them by the

答案

have sb.by the throat
扼住了某人的咽喉
形容将对方完全掌控 使对方不得不依赖于自身