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万が一

if by any chance, in the unlikely event that

→ 万一
adverb Rare #35,104
if by any chance, in the unlikely event that Often used when talking about an unlikely possibility or preparing for something that might go wrong.
JA: 万が一電車が遅れたら、電話してください。
EN: If the train happens to be delayed, please call me.
Forms of 万一
万一万が一

万が一、何かあったら、どうか子供たちの面倒をみてやってください。

If anything should happen to me, please take care of the children.

もし万が一彼女が日本に来るとすれば、ジェーンはとても喜ぶだろう。

If by any chance she were to come to Japan, Jane would be delighted.

でもすごくゆっくり歩くからね万が一気が変わるかもしれないから

But I’ll walk very slowly, just in case you change your mind.

— 罪人たち (2025)

もし万が一私が失敗したら両親は何と言うだろう。

I wonder what my parents would say if I failed.