From here it is all downhill.

I just don't want to do the downhill.

There is an uphill for every downhill, and a downhill for every uphill.

Shit rolls downhill

Since the late 1970s, it's all been downhill, it's all been on the defensive.

If [students] don't show we care by voting, when an issue arises we do care about ... we won't have much bargaining power.