downhill

She bent at the knee when she skied downhill.

她滑雪下山时曲膝下蹲。

I mean really, once they eliminated the choking hazard, it was all downhill for me.

我是说真的，一旦他们消除了窒息的危险，那就都是我要走的下坡路。

At that time our relations were going upwards, but since then they have been going downwards [downhill].

那时我们的关系是走上坡路, 此后就开始走下坡路了。