Deteriorate, Degrade, Descend, Decay

Deteriorate恶化，使变质；常指健康状况恶化；Degrade降低某人的地位，降低……的品质，有辱……的人格；使讲解，使退化；Descend（使）下降，指空间的下降，（财产、习惯等）由……传下来；起源（于），使……的后裔（与from连用）；袭击（与on连用）；把身份降至，沦为；Decay腐蚀，使腐败，腐烂；衰败，衰退，衰落。

But the probability will go up if the economy continues to deteriorate at the current rate.
但如果经济继续以当前速度恶化，这种可能性将会上升。
 This will degrade performance.
这样将降低性能。
He was ultimately overthrown and the country descended into chaos.
他最终被推翻，国家陷入了混乱。
The tree began to decay as soon as it was cut down.
树一被砍倒，它就开始腐朽。