Downhill is a term used to describe a downward slope or decline, typically in reference to a physical terrain or a situation. It can also refer to a type of skiing or biking that involves descending a steep slope. In a figurative sense, downhill can describe a situation or trend that is worsening or deteriorating. It can also be used to express a sense of ease or lack of effort, as in “it’s all downhill from here.” Overall, downhill conveys a sense of movement towards a lower point or a decrease in difficulty.