Examples:

• Saving for a rainy day?
• I've got one I've been saving for a rainy day.
• All right, I got an informant I was saving for a rainy day.
• I've been saving for a rainy day.
• Well, I've got one I've been saving for a rainy day.
• He admits that, initially, saving for a rainy day, and his reluctance to part with the readies had prompted his cultivating the hobby.