The word "动手动脚" is formed by combining two parallel verb-object phrases: "动手" (to move hands) and "动脚" (to move feet). Each phrase uses the verb "动" (to move) paired with a body part noun, "手" (hand) and "脚" (foot), respectively. Their repetition creates a cohesive unit that amplifies the sense of physical activity, leading to an idiomatic meaning often associated with inappropriate physical contact or meddlesome action.