• mongrelise

From mongrel +‎ -ize.

mongrelize (third-person singular simple present mongrelizes, present participle mongrelizing, simple past and past participle mongrelized)

1. To cross-breed an animal

   To mongrelize a dog

2. To become mixed - inoffensive when used as an object.
3. (derogatory, offensive, of a person) To become ethnically mixed.