v. Obs. [ad. Fr. abastardir (as old as 12th c.) from à prep. + bastard. Cf. OSp. abastardar.] prop. To make or declare bastard or illegitimate: hence, to make spurious or degenerate; to debase, corrupt, deteriorate.
1610. Donne, Pseudo-Martyr, 226. § 6. In some of the meane Parents by the way there may be fallacies which may corrupt & Abastard it.
1651. Life of Father Sarpi, 86 (1676). They further insinuated that the Roman Religion was insensibly abastarded.