devolve
verb (used with object)
to transfer or delegate (a duty, responsibility, etc.) to or upon another; pass on.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Various private Facebook groups, which alumni on all sides of the issue had used to spread news and rumors for months, were devolving into self-reinforcing pools of sanctimony and even rage.
From New York Times ● Oct. 13, 2016