N-PLURAL [usually inNOUN]人群 If you say that people are going somewhere or doing something in droves, you are emphasizing that there is a very large number of them. 人群 [emphasis] [Also + of]
Scientists are leaving the country in droves.
科学家们正成批地离开这个国家。
In the warm petrol-scented night, droves of young men and girls were strolling along the quays and packing the bars.