A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A short squeeze occurs when investors holding short positions find that the market has not fallen as they hoped but has risen just as they have to make good on their obligation to deliver securities or a physical commodity. The sudden increase in demand exceeds immediately available supplies. It leaves them at the mercy of those in possession of supplies and forces them to compete against each other to obtain them, driving prices sharply higher.
See also: Short-Selling, Short Covering