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1. Fix firmly or securely
   - intrench
    
2. Have a negative effect on, esp. by somehow restricting; infringe upon
   "This matter entrenches on other domains";
   - impinge, encroach, trench [archaic]
    
3. Occupy a trench or secured area
   "The troops entrenched for the night";
   - dig in

Derived forms: entrenched, entrenches, entrenching

Type of: fasten, fix, secure, take advantage, trespass

Encyclopedia: Entrench