|1.||[ noun ] (geography) the downward slope of a hill|
|2.||[ adjective ] sloping down rather steeply|
|3.||[ adverb ] toward the bottom of a hill|
"running downhill, he gained a lot of speed"
|4.||[ adverb ] toward a lower or inferior state|
"your performance has been going downhill for a long time now"
|5.||[ noun ] (sport) a ski race down a trail|