When combined, 大势已去 (dà shì yǐ qù) literally translates to “The great momentum has already left.” This paints a vivid picture of a powerful, favorable trend that has now vanished, leading to an inevitable decline or failure.
This idiom is deeply embedded in Chinese strategic and historical thinking. It reflects a cultural emphasis on understanding the “大势” (dàshì), or the “grand trend” of the times. Success in traditional Chinese thought, whether in war, politics, or business, often depends on aligning oneself with this trend. To have the “大势” on your side is to have historical momentum and popular support. Consequently, “大势已去” is a profound declaration of strategic failure. It can be compared to the Western phrase “the writing is on the wall” or “the tide has turned.” However, there's a subtle difference. “The writing is on the wall” suggests a clear sign or omen of future doom. “大势已去” is less about a sign and more about the loss of an almost tangible force—the `势 (shì)` or momentum. It implies that a previously existing advantage or power has now dissipated, and it is this loss of energy, not just a warning sign, that seals one's fate. It’s the recognition that the “force” is no longer with you.
“大势已去” is a formal and rather literary idiom, but it is widely understood and used in various modern contexts to add weight and a sense of historical finality to a statement.