2835621 jmdict A [id=2165010] 膝カックン;膝かっくん ひざカックン[膝カックン];ひざかっくん[膝かっくん];ヒザカックン[nokanji] [1][n] knee dislocation [2][n] making someone's knees bend (by hitting them behind the knees with one's own knees)