The word 侵入 is formed by combining two characters, each contributing a core action to create a unified concept. The first character, 侵, originally depicted an ox pulling a plow, conveying a sense of slow, steady, and often forceful advancement or encroachment. The second, 入, is a simple pictograph of something entering or going inward. When merged, the compound visually and conceptually layers the gradual, pressing action of 侵 with the decisive, boundary-crossing action of 入, resulting in the meaning of "to invade" or "to intrude", where force meets entry.