開埋井俾人食水 [开－－－－－－]

Jyutping hoi1 maai4 zeng2 bei2 jan4 sik6 seoi2
Pinyin kāi mái jǐng bǐ rén shí shuǐ

Definitions (CC-CANTO)
  1. to work so hard for something (especially something that one has initiated from scratch) only for someone else to take the credit