nounC2Very rare — outside the 30,000 commonest English words, so you will meet it in writing rather than in speechToo rare in one of the two pools to compare — fewer than 20 uses in speech or in writing
Other forms: entrenchments
Entrenchment is being dug in so firmly that change is very hard. Political entrenchment.
The image is a trench, which is exactly what it was in the First World War. Entrenchment in law means a rule that is deliberately made hard to repeal.
Definitions of entrenchment
1nounentrenchmentBeing dug in so firmly that change is very hard.C2
“The entrenchment of both sides made any settlement impossible.”