entrench

(verb) fix firmly or securely. Synonyms: intrench.

(verb) impinge or infringe upon. Synonyms: impinge, encroach, trench. Examples: "This impinges on my rights as an individual." "This matter entrenches on other domains."

(verb) occupy a trench or secured area. Synonyms: dig in. Example: "The troops dug in for the night."