不bat1二ji6法faat3門mun4

English

1. the one and only way
2. the only correct approach to a subject, the best or the only way
3. the only proper course to take

粵語 — Cantonese

1. 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

Examples

• 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.