English

leglock

From leg + lock.

A compound of leg + lock

Proto-Germanic *lagjaz ‘leg’

Old Norse leggr ‘leg’

Middle English leg ‘leg’

English leg

Proto-Indo-European *lewg- ‘to bend’

Proto-Germanic *luką

Proto-West Germanic *lok ‘shutter’

Old English loc

Middle English lok

English lock

Today it means

noun A joint lock directed at the ankle, knee, or hip joint.

Language periods are conventional ranges, not dates for this word.