/oʊθ ʌv əˈliːdʒəns/ – Phrase
Definition: thề trung thành trước quốc kỳ của những người được nhập quốc tịch.
A more thorough explanation: An oath of allegiance is a solemn declaration or promise made by an individual to be loyal and faithful to a particular country, government, or authority. It is a formal commitment to support and uphold the laws, values, and principles of the entity to which the oath is sworn.
Example: The new citizens took the oath of allegiance to the country before being granted citizenship.