Armbar

From Mixed Martial Arts Wiki

An armbar is a joint lock that hyperextends the elbow joint. It is typically applied by placing the opponent's extended arm at the elbow over a fulcrum such as an arm, leg or hip, and controlling the opponent's body while leveraging the arm over the fulcrum. It is used in various grappling martial arts, including Brazilian jiu-jitsu, Catch wrestling, Judo, Jiu-Jitsu and is one of the most common ways to win a match in mixed martial arts competition.