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downhill

adverb
  1. toward the bottom of a hill
    “Running downhill, we gained a lot of speed.”
  2. toward a lower or inferior state
    “your performance has been going downhill for a long time now”
adjective
  1. sloping down rather steeply
    declivitousdownward-sloping
noun
  1. a ski race down a trail
  2. the downward slope of a hill