1. To move down from some higher thing or position maintaining smooth, continual contact with some surface. Come on, just grab the pole and slide down from up there! The crate fell out of the truck and slid down from the top of the hill.

2. To cause someone or something to move down from or along (something) while maintaining smooth, continual contact. In this usage, a noun or pronoun is used between "slide" and "down from." We'll need to slide the wardrobe down from the top of the upstairs. She hooked the bag onto the zipline and slid it down from the tower to the people below.