小の虫を殺して大の虫を助ける

しょうのむしをころしてだいのむしをたすけるshounomushiokoroshitedainomushiotasukeru

expression · ichidan 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 help a large one

Study it in Yanamino