The character 打 originally depicts a hand striking something with a tool, conveying a sense of forceful action, while 扫 pictographically represents a hand holding a broom sweeping the ground. Combined in 打扫, the formation is conceptual: the first action (打) implies a preparatory, loosening, or striking motion (like beating dust out of a carpet or furniture), and the second action (扫) completes the process by gathering and removing the debris. Thus, the word is formed through a logical sequence of two complementary physical actions that together create the complete and thorough meaning of "to clean up".