万一の時

in case of an emergency

→ 万一
phrase Rare #30,259
in case of an emergency Refers to an unlikely but possible event or unforeseen situation.
JA: 万一の時に備えて、連絡先をメモしておきます。
EN: I’ll write down the contact information in case of an emergency.

万一の時に備えて手すりにつかまりなさい。

Hold on to the handrail in case of an emergency.

万一の時は教団が君らの面倒を見るよ

If anything happens, the organization will take care of you.

— マルコムX (1992)

万一の時は

In case of an emergency,

— TAXi (1998)

このお金は万一の時のためだよ。

This money is for emergencies.