Lewis & Short

prō-verto (-vorto), no perf., sum, 3, v.a., to turn forwards (ante-class.): ut transversus, non proversus cedit, quasi cancer solet, turned forwards, i. e. straightforwards, Plaut. ap. Varr. L. L. 7, § 81 Müll.: provorsum fulgur appellatur, quod ignoratur noc tu an interdiu sit factum, etc., Fest. p. 229 Müll.