Slide+down+hill
131snowboarding — [ˈsnəʊˌbɔːdɪŋ] noun [U] a sport in which you stand with both feet on a large curved board and slide down a hill that is covered in snow snowboard noun [C] …
132D valve — Slide Slide, n. [AS. sl[=i]de.] 1. The act of sliding; as, a slide on the ice. [1913 Webster] 2. Smooth, even passage or progress. [1913 Webster] A better slide into their business. Bacon. [1913 Webster] 3. That on which anything moves by sliding …