Entrench (verb)

1. To fortify or defend (a position or attitude) so as to make it stronger and more difficult to change.
2. To establish or embed (a habit, tradition, or practice) firmly in a situation.

Origin:

Early 17th century: from french entrencher, based on trench "ditch".

Examples:

1. The company entrenched itself as a leader in the market.
2. The law was designed to entrench the rights of workers.
3. His attitude was entrenched and he refused to change his mind.
4. Her love for classical music was entrenched from a young age.
5. The new policy entrenched the principles of equality and justice.