1. the downward slope of a hill

2. a ski race down a trail

1. sloping down rather steeply

1. toward a lower or inferior state;

   "your performance has been going downhill for a long time now"
   

2. toward the bottom of a hill;

   "running downhill, he gained a lot of speed"
   

1.向山下;在山下
If something or someone is movingdownhill or isdownhill, they are moving down a slope or are located towards the bottom of a hill.

downhill

e.g. He headeddownhill towards the river...
他朝山下的河流走去。
e.g. The lake itself lies only a few hundred yards off to your right and slightlydownhill...
湖本身就在你右侧仅几百码的地方，稍微向山下走几步。

2.走下坡路地;恶化地;每况愈下
If you say that somethingis going downhill, you mean that it is becoming worse or less successful.

downhill的反义词

e.g. Since I started to work longer hours things have gone steadilydownhill...
自从我开始加班以来，事情日趋恶化。
e.g. For the movie business, it was alldownhill from there...
电影业从那时就开始完全走下坡路了。

3.(与前段时间相比)容易的
If you say that a task or situation isdownhill after a particular stage or time, you mean that it is easy to deal with after that stage or time.

e.g. Well, I guess it's alldownhill from here.
嗯，我猜从此以后就容易了。

1. 下坡：上坡(Uphill)击球与下坡(downhill)击球首先,在上坡(Uphill)击球方面,这种球因为是倾斜的关系,会使得杆面角度更为垂直,所以比较容易高飞,但也比较容易击短,因此要打得稍微重一些,才会是您所想要的距离.

2. downhill

2. 高山速降：在19世纪中期,一些矿工发明了世界上最早的高山速降(downhill)比赛. 他们为了金子和荣誉而比赛,在一派叫嚷,狂饮和赌博的气氛里,一个营地和另一个营地进行比赛. 长板滑雪比赛者使用的是12英尺长的滑雪板,

3. 下山：滑雪可分为下山(downhill)和越野(Cross-country)两种.downhill就是一般人印象中的从山坡上往下滑,追求那种高速穿梭的心跳和刺激;Cross-country则是踏上滑雪板在山地、林间行走,体会亲近自然和享受孤寂的境界.downhill一般都在固定的滑雪场进行,

4.

4. 速降：骑行风格:速降(downhill) 自由骑行(Freeride)DHX Air 5.0 回弹调整 (Rebound)ProPedal是Fox的专用词语,用以形容后避震器透过滤掉低速压力(一般从骑乘踏板时产生)而得到的踩踏效率.