to sacrifice oneself torturously working for another or for a group
to pour in one's utmost effort
to shed one's last ounce of strength for
Definitions (粵典–words.hk)
動詞
為一個人做嘢,去到可以為佢死嘅地步 to pledge one's life; to work oneself to death for someone
佢唔係好人,你唔值得為佢賣命㗎。
佢唔系好人,你唔值得为佢卖命㗎。
keoi5 m4 hai6 hou2 jan4, nei5 m4 zik6 dak1 wai6 keoi5 maai6 meng6 gaa3. He's not such a good person, you don't deserve to work yourself to death for him.
Definitions (Wiktionary)
verb
to work one's fingers to the bone for; to pour in one's utmost effort