1. to deny responsibility for or connection with something
2. to refuse to acknowledge or accept as valid

Examples

• The politician quickly disavowed the controversial statement made by his aide.
• She disavowed any knowledge of the illegal activities.
• The company disavowed responsibility for the data breach.
• He disavowed his earlier support for the policy.
• The organization disavowed the actions of its former member.
• They disavowed the treaty after the new government took power.
• The candidate disavowed the endorsement from the extremist group.