A situation that occurs when a large number of bank or other financial institution's customers withdraw their deposits simultaneously due to concerns about the bank's solvency. As more people withdraw their funds, the probability of default increases, thereby prompting more people to withdraw their deposits. In extreme cases, the bank's reserves may not be sufficient to cover the withdrawals. A bank run is typically the result of panic, rather than a true insolvency on the part of the bank; however, the bank does risk default as more and more individuals withdraw funds - what began as panic can turn into a true default situation.
[http://www.investopedia.com/terms/b/bankrun.asp]
Sayed Farrukh Ahmed
Assistant Professor
Faculty of Business & Economics
Daffodil International University