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）

Japanese vocabulary

Meaning: to have a good opportunity only to let it slip from your grasp; to come home empty-handed despite having entered treasure mountain

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “宝の山に入りながら手を空しくして帰る” pronounced in real videos (YouGlish)