downhill vs upslope

downhill

adj
  • Going down a slope or a hill. 

  • Easy. 

  • Located down a slope or hill. 

verb
  • To take part in downhill skiing. 

noun
  • The fastest of the disciplines of alpine skiing. 

  • A rapid descent of a hill in related sports, especially in alpine skiing. 

adv
  • Deteriorating, getting worse. 

  • Down a slope. 

upslope

adj
  • in a direction up a slope 

noun
  • an upward slope 

adv
  • up a slope 

How often have the words downhill and upslope occurred in a corpus of books? (source: Google Ngram Viewer )