The word 结尾 is formed through the logical combination of two conceptual images: 结 (jié), which carries the core idea of "tying together" or "bringing to a close", and 尾 (wěi), which means "tail" and represents the final part or extremity of something. Together, they create a compound where the action of "tying up" is applied directly to "the tail end", metaphorically visualizing the act of completing or finalizing something, much like neatly binding the conclusion of a matter or story.