腕挫手固 Ude-hishigi-te-gatame (hand armlock) TGT

A lock. From your opponent’s right side, use your left hand to reach under his right armpit to grip his left front collar, at the same time gripping his right wrist with your right hand so as to extend his elbow against the joint. Alternatively, use one or both hands to grip your opponent’s wrist and twist it around behind him to control his elbow joint.