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1.
(FINANCE) borrowing securities for immediate sale, in anticipation of a sharp decline. Short selling requires strong nerves and excellent market timing; it also requires the ability to locate tranches of securities to borrow. If the short seller is correct, then she can buy back the securities at a much lower price, and lock in very high profits with very little initial investment.

Closely related to the concept of a short position. However, a short position includes buying put options (for example), while a long position could include short selling put options. So they are not exactly the same.

If a short sellers are wrong about the market, they are left hastily covering shorts, or buying the item they borrowed at a HIGHER price than they sold it for.
Jim Fisk was a master of the short squeeze; he appeared to cooperate with short selling until he was able to call in loans, forcing his counterparties to cover their shorts.
by Abu Yahya September 02, 2010