A rapid decline in the value of any stock, bond or other investment vehicle generally triggers a 'sell-off' situation. This includes heavy selling of stocks, etc,.. based on weak financial reports or under performance of the company.
For example, the recent decline of real estate industry and heavy losses in the sub-prime mortgage sectors caused panic among investors dealing in such stocks, bonds, and hence were sold, at least favorable prices [some even at a few cents]. This selling phenomenon is generally termed as a 'sell-off' in the financial industry.
