gentilize

from The Century Dictionary.

• To render gentle, polite, or gentlemanly; raise to the rank of gentlemen.
• To live like a gentile, or like a heathen.
• To play the gentleman. Norden, Surveyor's Dialogue (1608).

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb rare To render gentile or gentlemanly.
• intransitive verb obsolete To live like a gentile or heathen.
• intransitive verb obsolete To act the gentleman; -- with it (see It, 5).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb To render gentile or gentlemanly.