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Jyutping seoi2 fo2 bat1 jung4
Pinyin shuǐ huǒ bù róng

Definitions (CC-CEDICT)
  1. completely incompatible
  2. lit. incompatible as fire and water
Definitions (粵典–words.hk)
  1. 語句
    (​指人​)​對​立​嘅​、​唔​可以​同時並​存​嘅​;​夾唔​埋
    (of person)to be on bad terms with each other; can't get along well with each other
    • 佢哋兩個水火不容,成日嗌交。
      佢哋两个水火不容,成日嗌交。
      keoi5 dei6 loeng5 go3 seoi2 fo2 bat1 jung4, sing4 jat6 ngaai3 gaau1.
      They don't get on with each other and they always have quarrel.
Definitions (Wiktionary)
  1. phrase, idiomatic, of two people
    to be utterly opposed and incompatible
Examples (粵典–words.hk)
  1. Cantonese
    佢哋两个水火不容,成日嗌交。
    佢哋兩個水火不容,成日嗌交。
    keoi5 dei6 loeng5 go3 seoi2 fo2 bat1 jung4, sing4 jat6 ngaai3 gaau1.
    • They don't get on with each other and they always have quarrel.