The word 降落 is formed by combining two characters, each contributing a related action to create a single, more specific concept. The first character, 降, primarily means "to descend" or "to lower". The second character, 落, means "to fall" or "to alight". When placed together, they sequentially reinforce and refine the idea of a controlled, downward motion, resulting in the combined meaning of "to land" or "to touch down", as an aircraft or object does from a higher to a lower position.