The word "封锁" is formed through the logical combination of two meaningful characters, where the first, "封" (fēng), means to seal, close, or confer, and the second, "锁" (suǒ), means to lock or fasten. They are joined in a parallel structure where each character contributes a similar but reinforcing action, one of sealing off and the other of locking down. Together, they create a single, intensified concept meaning "to blockade" or "to封锁", where the combined image is of completely cutting off access, as if by both sealing an area and then locking it shut.