The act of establishing something in a strong, secure, or unchangeable position. The entrenchment of the company's policies made it difficult for new ideas to be implemented.
A trench or system of trenches dug by troops to provide a place of shelter from enemy fire. The soldiers took cover in the entrenchment to avoid the incoming artillery.
The process by which a river or stream cuts downward into its bed, deepening the channel and creating steep banks. Prolonged entrenchment of the river has carved a narrow gorge through the limestone.