be downhill all the way
1. To be bad and steadily worsening. Once my parents opened my report card and saw how bad my grades were, it was downhill all the way—not a great night for me.
2. To be increasingly easy (as if one is literally traveling downhill, as opposed to uphill). I'm sure I can finish the rest of the experiment on my own—it's downhill all the way.
be downhill all the way
1 be easy in comparison with what came before. 2 become worse or less successful.