小の虫を殺して大の虫を生かす

しょうのむしをころしてだいのむしをいかすshounomushiokoroshitedainomushioikasu

expression · godan verb

1. to sacrifice something small in order to save something great
2. to lose a leg to save one's life
3. to kill a small bug and save a large one

Study it in Yanamino