Bastardize

['bɑːstədaɪz;'bæst-] or ['bæstɚdaɪz]

(verb.) declare a child to be illegitimate.

(verb.) change something so that its value declines; for example, art forms.

Checked by Leon--From WordNet

(v. t.) To make or prove to be a bastard; to stigmatize as a bastard; to declare or decide legally to be illegitimate.

(v. t.) To beget out of wedlock.

Checker: Marty