Repudiate (verb)

1. To reject the validity or authority of.
2. To refuse to have anything to do with; to disown.

Origin:

From the latin repudiare, meaning "to divorce" or "to reject".

Examples:

1. The country repudiated the treaty it had signed.
2. He repudiated his former beliefs.
3. The company repudiated the contract due to breach of terms.
4. The government repudiated the accusations as baseless.
5. The heir repudiated the inheritance left to him.