proverto

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.