disavow – to deny responsibility for; to deny that you know or are involved in something
(Pronounced dis-uh-vow)
To remember the definition of the word disavow, use the following mnemonic:
She disputed that she had made a vow (disavow) to marry. She had been drunk all night and denied any responsibility or knowledge about it.

Examples of disavow in a sentence
In order to disavow her part in the robbery, the criminal had to testify against her conspirators.
No one knew that his ultimate plan was to disavow his role in the assassination.
They were quick to disavow the rumour.