ihn trench
transitive verb
1. to protect or fortify (oneself), as with trenches.
“The enemy, however, then entrenched themselves in a third and stronger position, called Musfeia, enclosed by high hills, and fortified in front by numerous swamps and palisades.”
2. to establish firmly and unchangeably.
His beliefs were entrenched, and neither his daughter nor his son could change his mind.
“Obama Takes on Entrenched African Power Structures in Speech“