to use others' manpower and resources for one's own ends

这家公司善于草船借箭，利用社交媒体的流量带动了自己的销售。

using straw boats to borrow arrows, an allusion to a strategy from the Romance of the Three Kingdoms

诸葛亮通过草船借箭，一夜之间筹足了十万支箭。