noun
arm lock; armlock
A grappling hold in martial arts or combat sports that hyperextends or twists the opponent's arm to control or submit them.
柔術の試合で、彼はアームロックを決めて相手をタップさせた。
In the jiu-jitsu match, he applied an arm lock and made his opponent tap out.
Variant with a middle dot, sometimes seen in dictionaries or technical writing.
Borrowed from English 'arm lock'.