An order to a broker to buy a security and sell the same security, but only if the broker can achieve a certain price differential. For example, an investor may make a swap order to buy a certain number of shares of Stock X and sell the same number of shares, but only if the broker can sell them at $1 more per share. If the broker is unable to do this, then no part of the order is executed. A swap order is also called a switch order.
See swap order.