1 down a slope: The road goes downhill from here onwards.
az: üzü aşağı, yoxuş aşağı
ru: под гору
2 towards a worse and worse state: We expected him to die, I suppose, because he's been going steadily downhill for months.
az: pisləşə-pisləşə
ru: всё хуже и хуже
See also:
English-Azerbaijani dictionary