From Longman Dictionary of Contemporary Englishdownhilldown‧hill1 /ˌdaʊnˈhɪl◂/ adverb1BOTTOMtowards the bottom of a hill or towards lowerlandOPP uphill
I was going downhill and my brakes failed.2 →go downhillExamples from the Corpusdownhill• You feel the situation is going downhill.• I awoke in pain, still hung over from the Nembles, and from there I proceeded to stumbledownhill.• Nora guessed that if there was a fox in there and if it broke, it would seek first to go downhill.• The wind was strong from them to me so eventually they would scent me when they'd passed downhill.• After we get to the top it'll be downhill all the way to Kendal.• It was downhill in top gear now.• The truckrolleddownhill into a parked car.• They have different styles: Warren runs downhill, looking to make cuts, while Broussard is more explosive.• The men had been in unknown country, chasing the boaruphill, when the rule is to chase downhill only.• We set off downhill towards the lake.downhilldownhill2 adjective1HORIZONTALon a slope that goes down to a lower pointOPP uphill
downhill skiing
It’s a long walk back, but at least it’s all downhill.2 →be all downhill (from here)/be downhill all the way (from here)Examples from the Corpusdownhill• Since the Second World War it has all been downhill.• When she arrived at the edge of the covert, she made her way cautiously along its downhillfringes.• The third was a downhill par-four of 286 yards on which par was an exceptionally pleasing score.• He grabbed one out of my hand and lined up a tough 10-footdownhillputt.• I faced an uphill challenge with a downhill set of assets.• But somewhere along the line, downhillskiing was too much of a chore and an expense.• a downhillslideFrom Longman Business Dictionarydownhilldown‧hill /ˌdaʊnˈhɪl/ adverbif something that was successful is going downhill, it is starting to fail, and is getting gradually worseSales had peaked in 2005 at $3.8 million but had gone steadily downhill.