[shuāi luò]
decline; be on the wane; go downhill; fading; decay; decaying; lapse; erode
fall into decay with each passing day; be on the decline
日趋衰落
be on the wane
日益衰落
The nation declined as a world power.
作为一个世界强国， 这个国家已经衰落。
The old civilization was fast falling into decay.
旧文化很快地衰落下去。