past participle of swear
"The sworn statement submitted by the witness confirmed what he had seen that night."
Given or declared under oath.
"The sworn testimony from the witness convinced the jury of his innocence."
In plain English: Sworn means officially promised to tell the truth, usually during a legal situation.
"They are sworn brothers who have pledged their loyalty to each other forever."
The word "sworn" comes from the Old English verb meaning "to swear." It is the past participle form used to describe someone who has taken an oath.