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> Or when someone says that they're going to "take a rain check" on an activity that doesn't have an entry fee?

Wait, what is a rain check?! Does it involve money?

I always thought it meant "I'll go check if it's raining (and never come back)", but it turns out that a rain check is an IOU given out when an outdoor activity is disrupted by weather, so you can use it for a later event.

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