noun, noun or participle which takes 'suru', transitive verb
Formal declaration of truth or commitment, often in legal, official, or ceremonial settings. Used as a noun or with する to mean 'to swear an oath' or 'to take a pledge'.
証人は法廷で宣誓をした。
The witness took an oath in court.
新入生は
New students take a pledge at the entrance ceremony.