What do you mean by saying entrench up on?

Answer:
-verb (used with object)
1.
to place in a position of strength; establish firmly or solidly: safely entrenched behind undeniable facts.
2.
to dig trenches for defensive purposes around (oneself, a military position, etc.).

-verb (used without object)
3.
to encroach; trespass; infringe (usually fol. by on or upon): to entrench on the domain or rights of another.
First answer by Verlicious. Last edit by Verlicious. Contributor trust: 8 [recommend contributor recommended]. Question popularity: 1 [recommend question].