1. Establish or fix something so firmly it's difficult to change
   "The old habits were deeply intrenched in his daily routine";
   - entrench
    
2. Dig trenches for military defence; take up a strong defensive position
   "The soldiers intrenched their position on the hillside";
   - entrench
    
3. Invade or encroach upon rights or territory
   "The decree intrenched upon ancient privileges";
   - entrench [archaic]

Derived forms: intrenched, intrenches, intrenching

Type of: fasten, fix, secure