disaffirm
/ˌdɪsəˈfɜrm/
verb
- To state or declare that something is not true, valid, or legally binding; to deny or repudiate.
- The company tried to disaffirm the contract after discovering the error.
- The witness later disaffirmed his earlier testimony under oath.
- The teenager was allowed to disaffirm the agreement because he was a minor.