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Jyutping guk1 gung1 zeon6 seoi6
Pinyin jú gōng jìn cuì

Definitions (Wiktionary)
  1. phrase, idiomatic
    to bend oneself to a task and exert oneself to the utmost; to spare no effort in the performance of one's duty

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Jyutping guk1 gung1 zeon6 seoi5
Pinyin jū gōng jìn cuì

Definitions (粵典–words.hk)
  1. 動詞
    盡心​盡力​;​不​遺餘力
    to spare no effort; to fully devote oneself
    • 佢為公司鞠躬盡瘁,但係竟然退休之前俾人炒咗。
      佢为公司鞠躬尽瘁,但系竟然退休之前俾人炒咗。
      keoi5 wai6 gung1 si1 guk1 gung1 zeon6 seoi5, daan6 hai6 ging2 jin4 teoi3 jau1 zi1 cin4 bei2 jan4 caau2 zo2.
      He worked for the company in his waking hours, yet despite of that, he was fired before retirement.

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Jyutping guk1 gung1 zeon6 seoi6
Pinyin jū gōng jìn cuì

Definitions (CC-CEDICT)
  1. to bend to a task and spare no effort (idiom); striving to the utmost
Definitions (Wiktionary)
  1. phrase, idiomatic
    to bend oneself to a task and exert oneself to the utmost; to spare no effort in the performance of one's duty
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    佢为公司鞠躬尽瘁,但系竟然退休之前俾人炒咗。
    佢為公司鞠躬盡瘁,但係竟然退休之前俾人炒咗。
    keoi5 wai6 gung1 si1 guk1 gung1 zeon6 seoi5, daan6 hai6 ging2 jin4 teoi3 jau1 zi1 cin4 bei2 jan4 caau2 zo2.
    • He worked for the company in his waking hours, yet despite of that, he was fired before retirement.