"减弱" 的英文表达是 "weaken".

它的来源可能来自拉丁语 "vĭcĭre"，意为 "疲弱"。

例句：

The storm weakened as it moved inland. (风暴随着向内陆移动而减弱。)

The medicine should help to weaken the virus. (这种药物应该有助于减弱病毒。)

His resolve weakened after a long day of traveling. (他经过一整天的旅行后，决心减弱了。)