まさかの時

まさかのとき【まさかの時】

an emergency; (the) time of need; a rainy day; when least expected.

●まさかの時に in case [time, the hour] of need; in case of emergency; in (an) emergency; if need be

・まさかの時に備える provide against (the) time of need [a rainy day]; prepare for the unexpected [worst].

●まさかの時の用意にいくらか貯金する lay by some money for [against] a rainy day.