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Jyutping bat1 ji6 faat3 mun4
Pinyin bù èr fǎ mén

Definitions (CC-CEDICT)
  1. the one and only way
  2. the only proper course to take
Definitions (粵典–words.hk)
  1. 語句
    要達成​某目​標​嘅​唯一一​個​正確​途徑​,​最好​或​獨一​無​二​嘅​方法
    the only correct approach to a subject, the best or the only way
    • 要屋企冇曱甴,保持室內整潔係不二法門。
      要屋企冇曱甴,保持室内整洁系不二法门。
      If you don't want cockroaches at home, keeping your place tidy and clean is the best method.
Definitions (Wiktionary)
  1. phrase, idiomatic
    the dharma gateway of nonduality
  2. phrase, idiomatic
    the one and only way; no second way of cultivation
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    不二法门
    不二法門
    bat1 ji6 faat3 mun4
    • the only correct approach to a subject; the best or the only way
  2. Cantonese
    要屋企冇曱甴,保持室内整洁系不二法门。
    要屋企冇曱甴,保持室內整潔係不二法門。
    • If you don't want cockroaches at home, keeping your place tidy and clean is the best method.