from O.Fr. eschace "stilt" (Fr. échasse), from Frank. *skakkja "stilt" (cf. Fris. skatja "stilt"), perhaps lit. "thing that shakes or moves fast" and related to root of O.E. sceacan "to vibrate" (see
shake). Or perhaps the Du. word is connected to M.L.G. schenke, O.E. scanca "leg" (see
shank). Sense alteration in Du. from "stilt" to "skate" is not clearly traced. The verb is attested from 1696; U.S. slang sense of "to get away with something" is attested from 1945.