mongrelize
mongrelise BrE

I pulled a chair up and watched his lips: glom the inside track to Jesus, fight the Jew-Communist conspiracy to mongrelize Christian America.

Or the times when a fellow with a with an unpronounceable last name would ask for permission to mongrelize my last name - to make it pronounceable, of course - to "submarine"!

The stated purpose was to save the "Nordic race" from "annihilation of our kind" and to "fight for survival against forces which would mongrelize our race and civilization" (Pearson, 1959, 2-3).

On the floor of the House of Representatives, Congressman John Rankin of Mississippi called Drew and the other critics of the Red Cross policy "crackpots," "Communists," "parlor pinks" and "fellow travelers" who were "trying to mongrelize this nation."