Verb
go downhill (third-person singular simple present goes downhill, present participle going downhill, simple past went downhill, past participle gone downhill)
(idiomatic) To worsen or degenerate.
I usually run fast enough, but my speed goes downhill when I don't sleep enough.
And that’s when everything started to go downhill. Source: Internet
I sure like v 1.6.2 and rely on it a lot and hate to see it go downhill with ver 2.x. Source: Internet
The GAO report starts out by praising the Webb mission for making “considerable progress” in the last few months in hardware integration, but things go downhill from there. Source: Internet
In reality, no matter how nice your are, and how fantastic your voice sounds, it will all go downhill if your room does not have some treatment. Source: Internet
Things go downhill from there pretty quickly for the son of the politician who kills himself and soon there is a missing child to worry about as well. Source: Internet
You know the Spago in Beverly Hills, I thought we had plateaued for a few years and then I said ‘if we don’t change now, we’re going to go downhill and then it’s too late.’ Source: Internet