If you start the phrase when in Rome… but don’t finish the sentence with do as the Romans do, or say birds of a feather… without adding flock together, you’re engaging in anapodoton, a term of rhetoric that refers to the act of saying only the first...
homophily n.— «Sociologists have a term for this birds-of-a-feather-flocking-together phenomenon: Homophily. Some explanations for America’s political homophily suggest that a president who is determined to be a uniter might be able to help the...