Hammering

The rapid and concentrated sale of a stock thought to be overvalued by the market. It performed by investors and speculators who beleive that prices are inflated and that a period of liquidation is imminent.

Investopedia Says:
Hammering the market is achieved through large sale orders or many small sell orders. In some cases, investors may even collaborate on orders to attempt to push the share's price even lower.

Related Links:
Want to profit on declining stocks? This trading strategy does just that. Short Selling Tutorial
Even though crashes, corrections and capitulations are bad news for investors holding the stock, there are still ways to profit. Connecting Crashes, Corrections And Capitulation