barbarize

verb

1. (transitive)To cause to become savage or uncultured.
2. (intransitive)To become savage or uncultured.

   “The Roman empire was barbarizing rapidly from the time of Trajan.”

3. (intransitive)To adopt a foreign or barbarous mode of speech.

   “The ill habit […] of wretched barbarizing against the Latin and Greek idiom, with their untutored Anglicisms.”