防範於未然 [－范于－－]

Jyutping fong4 faan6 jyu1 mei6 jin4
Pinyin fáng fàn yú wèi rán

Definitions (粵典–words.hk)
  1. 語句
    喺​未​發​生​之前​就​加以​防備
    to prevent something before it happens
  2. 參看
    防範未然