Definition of "phase in" [phase• in]

• To introduce something little by little (verb)

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• "A police captain was quoted expressing concern that while the Brotherhood of the 8-9-3 was frequently violent, these crimes almost always took place in tenderloin areas such as Kabukicho; the captain worried that a corpse in the elegant, historical glades of Kiyosumi Gardens indicated some new phase in criminal culture."
• "Like most of the Mexican girls and gay boys I knew, I went through a vicious, life-consuming Morrissey phase in high school, one that for a period of time made me hate the queen of England and Margaret Thatcher more than I hated the Los Angeles Police Department."
• "With the rise of Jansenism and the condemnation of "Augustinus" a new phase in the history of the Probabilist controversies began."