If things are “Going Downhill” it means that they are getting worse and worse. Here are some examples: “I used to be good at basketball when I was in high school, but my abilities started going downhill after I turned 40″. “She was really attractive when she was young but her looks have been going downhill lately”. “I think I will need glasses soon. My eyesight seems to be going downhill fast” So now you know how to use the popular term “going downhill“. I’m sure you’ll start to notice it more and more. It’s a great phrase so please remember to use it!