O.E. fællan, (Mercian) fyllan (W.Saxon) "make fall," also "demolish, kill," from P.Gmc. *fallijanan (cf. O.N. fella, Du. fellen, O.H.G. fellan), causative of *fallan (O.E. feallan, see
fall (v.)), showing
i-mutation. Related: Felled; feller; felling.