‘爬行’ literally combines ‘爬’ (to crawl or climb) and ‘行’ (to move or go), together meaning the act of moving along the ground on hands and knees, belly, or limbs — especially as seen in infants, reptiles, or insects. As a noun, it refers to the mode or instance of such movement; as a verb, it describes the action itself. It often carries a biological or zoological connotation, emphasizing slow, low-to-the-ground locomotion without upright posture.

The term is frequently used in scientific, educational, or descriptive contexts — for example, when discussing animal behavior, child development milestones, or evolutionary biology. While ‘爬行’ can describe human infants learning to move, it’s more commonly applied to animals like snakes, lizards, caterpillars, or turtles. Unlike the more general ‘爬’ (which may imply climbing a wall or tree), ‘爬行’ specifically evokes horizontal, ground-level motion — sometimes with a subtle nuance of slowness, caution, or primitive movement.