"to roll or twist," c.1300, from M.Du. or M.L.G. welteren "to roll," from P.Gmc. *waltijanan (cf. O.E. wieltan, O.N. velta, O.H.G. walzan "to turn, revolve," Ger. wälzen "to roll," Goth. waltjan "to roll"), from PIE base *wel- "to turn, revolve" (see
vulva). The noun