Lewis Short
(verb) : arcŭo, āvi, ātum, 1, arcus
* To make in the form of a bow, to bend or curve like a bow (not before the Aug. per.): curru arcuato vehi,i. e. covered,Liv. 1, 21: opus,Plin. Ep. 10, 46, 2: (millepeda) quae non arcuatur,does not bend itself in the form of a bow,Plin. 29, 6, 39, § 137 (cf. arcuatim); Ov. M. 11, 590.
Charlton T. Lewis, Charles Short, A Latin Dictionary