The word 尽头 is formed through the direct and vivid combination of two conceptual images: the character 尽, which conveys the idea of something being exhausted, used up, or coming to a complete finish, and the character 头, which literally means "head" but is used metaphorically to indicate an extremity, an end point, or a tip. By fusing these ideas, the compound creates a powerful spatial metaphor, it visually and conceptually represents the definitive point where something (like a road, a period of time, or an effort) runs out and can go no further, its very "head" or terminal point where all continuation is exhausted.