The word "缝合" is formed through a logical and conceptual combination of its two component characters. The first character, "缝" (féng), means to sew or stitch, representing the specific action of joining with a needle and thread. The second character, "合" (hé), means to close, join, or bring together. When combined, the word is created by sequentially and causally linking these ideas: the act of stitching ("缝") is performed for the explicit purpose and result of closing or joining something ("合"). This formation results in a compound verb that conceptually means "to suture" or "to sew up", where the method and the intended outcome are inherently fused into a single term.