means To move smoothly along a surface with little friction, or the noun for a thing you do that on — a playground chute, a coated lab plate, or a single image in a presentation.

from From Old English 'slīdan,' meaning to glide or slip. It belongs to a slithery Germanic family — a cousin of 'sled,' 'sledge,' and 'slither' — all built on a root suggesting smooth, slippery motion. The playground 'slide' and the projector 'slide' both came later, each named for the same effortless glide.