The idiom "a rainy day" has its roots in the idea of saving for unexpected or difficult times. It advises individuals to set aside resources or funds for future needs or emergencies. This idiomatic expression is often used to emphasize the prudence of saving for the future and being ready for unexpected expenses or challenges.

What is the origin of the idiom "a rainy day" and when to use it?

英語での「a rainy day」の定義と意味

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