Entry 1 sense Webster, 1913 Outslide · Out·slide · IPA /aʊtˈslaɪd/ 01 v. i. To slide outward, onward, or forward; to advance by sliding. 1. To slide outward, onward, or forward; to advance by sliding.[Poetic] “At last our grating keels outslide.” — Whittier.