The word "罢了" is formed through the conceptual fusion of two characters: "罢", which carries the core meaning of stopping or ceasing an action, and "了", which marks a sense of completion or finality. When combined, they move beyond their literal meanings to create a single expressive unit that conceptually "waves something away" or marks a matter as concluded for the purpose of the conversation. It forms not through grammatical rules, but through a rhetorical and pragmatic evolution, where the idea of "stopping it there" transforms into a spoken gesture of understatement, dismissal, or limiting the scope of what has been said, embodying a tone of resignation or downplaying.