From Middle English 'knak' (a sharp snap/click) — the sound of a clever trick landing evolved into the concept of natural talent.
An acquired or natural skill at performing a task; a talent for something.
From Middle English 'knak' (a sharp blow, a crack/snap), probably imitative of a clicking or snapping sound. The meaning evolved from 'a sharp trick' to 'a clever way of doing things' to 'a natural talent.' The original sense of a quick, snappy action is preserved in 'knick-knack.' Key roots