There are essentially two types of currency shortening:
1. In a Futures Market, you can sell a contract for that currency.
2. You will offer a currency tracker. For example, if you believe the US dollar would fall, you might offer a US dollar index that compares the US dollar’s value against a currency basket. This is called the U.S. Factor of the currency. You will offer the currency on the Forex market against another currency. All currencies will be traded in pairs in Forex. The name of each pair is an abbreviation of their currency names.