keep (something) for a rainy day

keep (something) for a rainy day

To reserve something, especially money, for use in a time or period of unforeseen difficulty, trouble, or need. I know you want to buy a new TV with your Christmas bonus, but you should really keep it for a rainy day. I keep a portion of my wages in a savings account each month for a rainy day.
See also: keep, rainy
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