Here are some ways to use "disavow" in a sentence:
* The politician disavowed the comments made by his campaign manager. (He denied any connection to the manager's statements.)
* The company disavowed the fraudulent actions of its former CEO. (They rejected any responsibility for the CEO's actions.)
* The author disavowed the unauthorized sequel to his bestselling novel. (He denied any involvement in the sequel.)
Essentially, "disavow" means to take a step back and say "That's not me! I have nothing to do with that!"