1. As he gets older his health goes downhill.2. The global economy is still going downhill despite aggressive efforts to repair it.
 go downhill get worse可以普遍用在很多情況
他越老健康越日漸衰退. 全球的金融一直再衰退, 即使大家都努力要讓它恢復.< >
She is shy, but when there is a guest at home, she becomes excited and hyperative and out of control.