Select the most appropriate idiom for the given group of words: A time when money might unexpectedly be needed.

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The idiom 'A rainy day' refers to a time when money or resources might unexpectedly be needed, often saved for emergencies or unforeseen circumstances. The other options do not fit this meaning: 'A raw deal' means unfair treatment, 'A rash of something' means a sudden occurrence of many similar things, and 'A rap over the knuckles' means a mild punishment or reprimand.

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