ŏb-uncus, a, um, adj.,
bent in , hooked (poet.): rostroque immanis vultur obunco, Verg. A. 6, 597: pedes, Ov. M. 6, 516: falx, Arn. 6, 197.
ob-uncus adj., bent in, hooked: rostro voltur obunco, V.: pedes, O. ...
An Elementary Latin Dictionary