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Jyutping leoi6 sei2 leoi6 wut6
Pinyin lěi sǐ lěi huó

Definitions (Wiktionary)
  1. phrase, idiomatic
    work oneself to death; tire oneself out through overwork

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Jyutping leoi6 sei2 leoi6 wut6
Pinyin lèi sǐ lèi huó

Definitions (CC-CEDICT)
  1. to tire oneself out through overwork
  2. to work oneself to death