radicalize

1. (transitive) To make radical.Examples: "The goal of the Cultural Revolution was to radicalize the whole society, to create mass participation at all levels of decision-making, and to restore the revolutionary élan of the 1940s."; "Described by witnesses as a keen cricketer and pubgoer until contacts with Islamic militants radicalized him on a trip to Pakistan, he was ordered to serve at least 14 years for the plot, and for supplying militants in Afghanistan with money and equipment."; "It’s been called “one of the most powerful radicalizing instruments of the 21st century,” “a petri dish of divisive, conspiratorial and sometimes hateful content,” and a tool that “drives people to the internet’s darkest corners.”"transitive

2. (intransitive) To become radical; to adopt a radical political stance.Examples: "He’s a delight and provides a little break in one’s timeline between heart-stopping political developments, at least until he himself radicalizes, which is bound to happen soon, because he is a French bulldog."intransitive