verb (used with object), bas·tard·ized, bas·tard·iz·ing.
verb (used without object), bas·tard·ized, bas·tard·iz·ing.
British Dictionary definitions for bastardise
Word Origin and History for bastardise
1610s, "to identify as a bastard," from bastard (q.v.) + -ize. The figurative sense, "to make degenerate, debase" is earlier (1580s), probably because bastard also was serving as a verb meaning "to declare illegitimate" (1540s). Related: Bastardized; bastardizing; bastardization.