1. To move forward while maintaining smooth, continual contact (over the length of something). I love ice skating. There is something so calming about spending an afternoon just sliding along on the ice. We slipped and slid along the icy path until we finally reached the parking lot.

2. To cause someone or something to move forward while maintaining continual contact (over the length of something). In this usage, a noun or pronoun is used between "slide" and "along." Please don't slide those crates along the floor like that—you'll scuff up the linoleum! With his ankle broken, all we could do was stretch him out on one of our jackets and slide him along until we got back to camp.