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Jyutping sei2 deoi3 kit3
Pinyin sǐ duì jiē

Definitions (Wiktionary)
  1. noun, Xiamen, Zhangzhou-Hokkien
    archenemy
    (syn.) 死對頭, 死对头
  2. verb, Xiamen, Zhangzhou-Hokkien
    to contend with each other; to neither give way to each other