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.