entrench
General verb
To establish an attitude, position, or force so firmly that change is difficult.
Both armies entrenched along the river and settled into a long war of attrition.
Law verb
To fix provisions in the articles so that they can be altered only by an enhanced procedure.
The founders sought to entrench their veto rights against later amendment.
Business verb
To fix a position so firmly that it becomes difficult to change or dislodge.
Both delegations had entrenched themselves behind incompatible pricing formulas.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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