The Collaborative International Dictionary of English v.0.48:

Barbarize \Bar"ba*rize\, v. i. [imp. & p. p. Barbarized; p.
   pr. & vb. n. Barbarizing.]
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   1. To become barbarous.
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            The Roman empire was barbarizing rapidly from the
            time of Trajan.                       --De Quincey.
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   2. To adopt a foreign or barbarous mode of speech.
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            The ill habit . . . of wretched barbarizing against
            the Latin and Greek idiom, with their untutored
            Anglicisms.                           --Milton.
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