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Jyutping kung4 zeoi1 bat1 se2
Pinyin qióng zhuī bù shě

Definitions (粵典–words.hk)
  1. 動詞
    不停​追查​、​追求​某​啲​人​或者​事​,​以達​到​某種​目的
    to pursue relentlessly
    • 特首唔肯撤回方案,市民窮追不捨。
      特首唔肯撤回方案,市民穷追不舍。
      dak6 sau2 m4 hang2 cit3 wui4 fong1 on3, si5 man4 kung4 zeoi1 bat1 se2.
      The Chief Executive refused to withdraw the bill, and the citizens pursued this issue relentlessly.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to not stop pursuing (someone or something)

窮追不捨 [穷--舍]

Jyutping
Pinyin qióng zhuī bù shě

Definitions (CC-CEDICT)
  1. to pursue relentlessly
Examples (粵典–words.hk)
  1. Cantonese
    特首唔肯撤回方案,市民穷追不舍。
    特首唔肯撤回方案,市民窮追不捨。
    dak6 sau2 m4 hang2 cit3 wui4 fong1 on3, si5 man4 kung4 zeoi1 bat1 se2.
    • The Chief Executive refused to withdraw the bill, and the citizens pursued this issue relentlessly.