I've heard it in several finance movies and the sentiment is kind of clear but what does it actually mean, "a run on a bank"?
closed as off-topic by chasly from UK, Edwin Ashworth, Avon, TimLymington, Dan Bron Aug 15 '15 at 16:12
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It means a large number of customers trying to withdraw their deposits in a short period of time. The bank only holds enough cash to allow a small percentage of all deposits to be withdrawn. So if the run is big enough, the bank's cash is exhausted and they have to close, at least for a short time.