entrench or intrench /in-trenchˈ or -trenshˈ/

1. To dig a trench around
2. To fortify with a ditch and parapet
3. To establish in a strong position (esp military)
4. To establish or fix firmly because of an unwillingness to change or in such a way that change is difficult or impossible
5. To cut into or wound (Spenser)

To encroach

entrenchˈment or intrenchˈment noun

1. A defensive earthwork of trenches and parapets
2. Any protection
3. An encroachment (obsolete)

entrenched provisions plural noun

In the constitution of a country, provisions specially safeguarded by being made subject to amendment or repeal only by exceptional procedure

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