"your performance has been going downhill for a long time now"
"running downhill, he gained a lot of speed"
The road coming downhill from the north-west turned south.
出自： E. Bowen
A stone rolled downhill.
出自： R. Adams
From this point it is downhill all the way: a host of deprivations and disasters.
It was downhill from then on, though it actually took a year to secure the country completely.