Germanize

to Germanize a province, a language, or a society

Why should Pennsylvania […] become a Colony of aliens, who will shortly be so numerous as to Germanize us, instead of our Anglifying them, and will never adopt our language or customs, any more than they can acquire our complexion?

In the preceding centuries the Ashkenazic Synagogue song had been Germanized to a degree that jeopardized not only its distinctive Jewishness but its very existence.