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Jyutping zaap6 gwaan3 sing4 zi6 jin4
Pinyin xí guàn chéng zì rán

Definitions (CC-CEDICT)
  1. habit becomes nature (idiom); get used to something and it seems inevitable
  2. second nature
Definitions (Wiktionary)
  1. proverb
    When you make it a habit, it will become second nature.
Examples (粵典–words.hk)
  1. Cantonese
    习惯成自然
    習慣成自然
    zaap6 gwaan3 sing4 zi6 jin4
    • over time, habits become second nature