Definition of downhill adverb from the Oxford Advanced American Dictionary

 

downhill

 adverb
adverb
NAmE//ˌdaʊnˈhɪl//
 
 
jump to other results
  • toward the bottom of a hill; in a direction that goes down to run/walk downhill opposite uphill
  • Idioms
    go downhill
     
    jump to other results
    to get worse in quality, health, etc. synonym deteriorate Their marriage went downhill after the first child was born. He's been going slowly downhill since he came out of the hospital.
    See the Oxford Advanced Learner's Dictionary entry: downhill