The word 赶走 is formed by combining two characters, each contributing an essential action to create a new, unified concept. The first character, 赶 (gǎn), carries the core idea of chasing, driving, or hurrying something along. The second, 走 (zǒu), means to walk or, more broadly, to leave. When placed together, they do not simply list two actions; instead, they merge into a single, causative sequence: the act of driving (赶) directly causes the result of leaving (走). It visually and conceptually portrays one character propelling the other away, forming the complete idea of "to drive away" or "to expel".