prae-vĭtĭo, āvi, ātum, 1, v. a.,
to corrupt or vitiate beforehand (poet. and in post-class. prose): (gurgitem), Ov. M. 14, 55: ex alio morbo praevitiati, Cael. Aur. Tard. 2, 1, 15.
prae-vitiō —, —, āre, to corrupt beforehand: (gurgitem), O. ...
An Elementary Latin Dictionary