Definition
To be significantly diminished in health, strength, or influence compared to one's past state.
（健康、力量或影响力）已大不如前。
Since the accident, he has been a shadow of his former self and unable to perform physical activities as he used to.
自从那次意外后，他已经大不如前，无法像过去那样从事体力活动。
After losing several key clients, the company is a shadow of its former self, with a significant drop in market share.
在失去几个重要客户后，这家公司已大不如前，市场份额大幅下降。
The once vibrant speaker is now a shadow of his former self after his illness, appearing weak and frail during presentations.
曾经充满活力的演讲者在生病后已大不如前，在演讲时显得虚弱无力。