Etymology
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downhill (adv.)

"in a descending direction," late 14c., from down (adv.) + hill (n.).  From 1590s as a noun, "downward slope of a hill;" meaning "downhill skiing race" is from 1960. As an adjective, "sloping downward, descending," from 1727.

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Definitions of downhill
1
downhill (n.)
the downward slope of a hill;
downhill (n.)
a ski race down a trail;
2
downhill (adv.)
toward a lower or inferior state;
your performance has been going downhill for a long time now
downhill (adv.)
toward the bottom of a hill;
running downhill, he gained a lot of speed
3
downhill (adj.)
sloping down rather steeply;
Synonyms: declivitous / downward-sloping
From wordnet.princeton.edu