萬maan6無mou4一jat1失sat1

English

1. surefire; absolutely safe (idiom)
2. would not fail under any circumstances; surefire ----unreviewed?
3. no risk at all; perfectly safeunreviewed?

粵語 — Cantonese

1. 絕對唔會失敗、犯錯；包保成功；實會掂過碌蔗unreviewed?
2. 毫無風險；絕對安全unreviewed?

Examples

• 想長命百歲有一個萬無一失的方法：每天吃一顆獅子頭，吃一百年。

  There's one surefire way to live to a ripe old age: eat a meatball a day for a hundred years.

  Tatoeba · LeviHighway CC BY

• unreviewed?

  帶埋手提電話去行山，就萬無一失喇！

  Bring along the mobile phone to go hiking and we'll be perfectly safe.