Short sale
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The practice of selling a security you don’t own in the first place, meaning you have negatively correlated exposure to the price of the security. To do this you will need to borrow the stock under a stock loan, and the agreement you will want for that, if you’re in the English speaking world outside America, will be the 2010 GMSLA. Note though that the stock loan isn’t the thing that makes you short, but your sale of the security you've just borrowed. Seeing as you have to return it, and you don’t have it, you will have to buy it. Obviously this works best for you if the stock declines in price in the mean time. That’s the point of your trade, see? During that period, you are paying the financing cost of that stock under your stock-loan.
Short selling is risky for you — your losses can be conceptually infinite — and for the issuers of the securities you short sell, especially if they happen to be financial institutions. Therefore this activity is regulated in many jurisdictions, including the EU in their wonderfully entexted EU Short Selling Regulations.
Other ways of going short
You can achieve a similar effect in a number of ways:
- Synthetic prime brokerage: By taking a short position under a synthetic equity swap or a total return swap
- Selling a credit derivative on an issuer’s reference indebtedness is a reasonably good proxy for a short position.