Dereliction of allegiance refers to the act of betraying one's country or violating the loyalty that one owes to their country. Some synonyms for dereliction of allegiance include disloyalty, treason, sedition, rebellion, and mutiny. Disloyalty is the act of being unfaithful or showing a lack of commitment to something. Treason is the act of betraying one's country, often involving attempts to overthrow the government. Sedition is the act of inciting rebellion or insurrection against a government. Rebellion is the act of resisting or opposing authority or government. Mutiny is the act of openly rebelling against authority, often by soldiers or sailors.