草船借箭

1. • lit. using straw boats to borrow arrows (idiom, from 三国演义 sānguóyǎnyì)
2. • fig. to use others' manpower and resources for one's own ends

Character by character

• 草(cǎo)grass
• 船(chuán)boat
• 借(jiè)borrow
• 箭(jiàn)arrow