副

It is a phonosemantic compound character, formed by combining:

刀 (칼 도) – the component indicating the meaning (“knife, to cut”), and

畐 (가득할 복) – the component indicating the sound.

Originally, this character meant “to cut” or “to divide” and was read as “복 (bok)”.

Over time, its meaning evolved and broadened to signify concepts like “to be second to,” “to be subordinate,” or “secondary.”