strong
劤 centers on physical strength or power. The single given meaning "strong" captures the core idea of force or might.
劤 combines 斤 (axe) and 力 (strength), suggesting the power or force of an axe. The exact historical development is uncertain, but the components point to a straightforward idea of strength.
An axe (斤) and strength (力) together: imagine a strong person swinging a heavy axe with ease. 劤 means strong.
For キン, picture a strong person named Kin lifting the axe: Kin -> キン, and his strength is obvious.