fly, to flit
翾 centers on light, quick flight: flying or flitting about with a sense of nimble, darting motion.
翾 combines 睘 (likely phonetic) with 羽 (wings), suggesting the idea of flying or flitting. The exact historical development is uncertain.
Wings (羽) on the right and a complex left side (睘) that looks like a quick, darting shape: imagine a small bird flitting rapidly through the air.
For ケン, picture a ken (a sharp, quick movement in martial arts) as the bird flits away: ken -> ケン.