/æbˈdʒʊreɪʃən əv əˈliːdʒəns/ – Pharse
Definition: việc thề từ bỏ quốc tịch cũ.
A more thorough explanation: a formal renunciation or repudiation of one’s allegiance to a sovereign or government. It is a legal act that severes the bond between an individual and the state.
Example: A person fleeing a totalitarian regime might be required to abjure allegiance to their home country before being granted political asylum in a democratic nation.