宝の山に入りながら手を空しくして帰る

たからのやまにいりながらてをむなしくしてかえるtakaranoyamaniirinagarateomunashikushitekaeru

expression

1. to have a good opportunity only to let it slip from your grasp
2. to come home empty-handed despite having entered treasure mountain

Study it in Yanamino