The phrase "are fully entrenched" is correct and can be used in written English.
It typically means that something is firmly established or deeply rooted and is difficult to change. Example: "The traditions of this small town are fully entrenched and have been passed down for generations."
A Our goal is to be fully entrenched in the tristate area before the end of the year.
He finished work on Fantastic Beasts in May and has been fully entrenched in fatherhood ever since.
The third phase of capitalism described by Ernest Mandel and others is fully entrenched: multinational corporations, globalised markets and labour, mass consumption and highly liquid multinational flows of capital.
By 15 she was fully entrenched in what counselors called an "oppositional phase" -- a hell that would consume her whole family for years.
By 1984, however, the East Village art scene was fully entrenched within the workings of the New York art world with over seventy commercial galleries located in the space of fourteen blocks.
At the time, I was fully entrenched in the membership-only Jenny Craig program, which featured a variety of frozen and shelf-stable meals, weekly meetings with a consultant and numerous celebrity endorsements.
So despite his growing unpopularity with fans, Jackson seemed to be fully entrenched, giving Dolan ample cover along the way.
We are interested in investigating specific physiotherapy treatment strategies in the subacute population of LBD, where spontaneous recovery is less rapid and the complex issues associated with chronic pain are less likely to be fully entrenched [ 4, 6, 27].
Letters: Martin Jacques's fear (Japan's resurgent nationalism has global ramifications, September 27) that Japan's current flirtation with nationalism might revert to old militarism is ill-conceived: democracy and rule of law are now fully entrenched in Japan's body politic.
