The word 出门 is formed by combining two pictorial-logographic characters that together create a concrete, spatial metaphor. The first character, 出, originally depicted a foot stepping out of a foot-shaped enclosure, conveying the core idea of "to exit" or "go out". It is then paired with 门, a pictogram of a double-door or gate, representing the specific boundary or threshold being crossed. Thus, the compound visually and conceptually maps the action of exiting through or from the doorway, forming the integrated meaning "to leave the house" or "go out".