Origin: 1250–1300; (v.) Middle English enbuss(h)en < Middle French embuschier to place men in ambush, literally, to set in the woods, equivalent to em-im-1 + busch- (< Vulgar Latin *busca wood, forest < Germanic *busk- heavy stick) + -ier infinitive suffix; (noun) earlier enbusshe < Middle French embusche, derivative of the v.
c.1300, from O.Fr. embuscher (13c., Mod.Fr. embûcher) "to lay an ambush," from en- "in" + busch "wood," apparently from Frank. *busk "bush, woods" (see bush).