take earthworm as a bait to catch fish
A Chinese idiom, y ǐ y ǐ NT ó uy ú, means to fish with earthworms as bait. It's a metaphor to trade a small price for a big gain. It comes from the biography of Xue Daoheng in the book of Sui Dynasty.
The origin of Idioms
According to the biography of Xue Daoheng in the book of Sui Dynasty, "Chen's envoys appointed Qi, and took him as the host and guest. He presented poems with fifty rhymes, which were harmonious in the way of balance, and the north and the South were beautiful. Wei Shou said: "Fu Fu's so-called" throwing worms into fish's ears. "
Idiom usage
As a predicate, attribute, that is, to throw a brick to attract jade
Analysis of Idioms
To throw a brick to attract a jade
take earthworm as a bait to catch fish
A tired bird knows how to return - juàn niǎo zhī huán