/tə swɛr fiːlti/ – Phrase
Definition: thề trung thành, tuyên thệ trung thành.
A more thorough explanation: To swear fealty means to make a formal pledge of loyalty and allegiance, typically in a historical or feudal context, to a ruler or superior authority. It involves a solemn promise to support and obey the person or entity to whom the fealty is sworn.
Example: The vassal knelt before the lord to swear fealty, pledging loyalty and obedience to his liege in accordance with the feudal contract.