a large crowd of people 一大群人 There are always hordes of tourists here in the summer. 夏天这里总有成群结队的游客。 - in hordes
Football fans turned up in hordes. 来了大批大批的足球迷。 He could see the infantry advancing in hordes across the open ground. 他可以看到步兵成群结队地穿过空旷的地面。 The elves defeated a huge horde of goblins. 精灵打败了一大群妖精。
Word Originmid 16th cent. (originally denoting a tribe or troop of Tartar or other nomads): from Polish horda, from Turkish ordu ‘(royal) camp’.