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もし万一

if by any chance

→ 若し
phrase Rare #24,344
if by any chance Emphasizes an unlikely or worst-case hypothetical situation. もし and 万一 can also be used separately; 万一 is often written 万が一.
JA: もし万一道に迷ったら、駅に電話してください。
EN: If by any chance you get lost, please call the station.

もし万一雨が降れば、彼はこないでしょう。

If it should happen to rain, he probably won’t come.

もし万一手伝いが必要なら、ぜひお知らせください。

If you happen to need any help, please don't hesitate to let me know.

もし万一外国へ行くとすれば、フランスにするでしょう。

If I were to go abroad, I’d probably choose France.

もし万一彼に君を助ける気持ちがあれば、すぐにやってくるだろう。

If, by any chance, he wanted to help you, he would come right away.