If you find yourself on a slippery slope, watch out: you could be sliding down a hill. Land that is not level is called a slope. Slope can also be a verb, as in land that slopes down to sea level.
Language experts believe the word slope came from the Middle English word aslope, an adverb that means “at an angle.” The word has a noun form you can use for something that is at an angle — on a slope — like a steep hill or the ramp in a parking garage. It also has a verb form that can be used to describe something that slants, like someone's signature with letters that slope to the left or an angled haircut that slopes to cover one eye.