1. having made a formal promise or oath
2. determined to remain enemies or opponents

1. past participle of swear

Examples

• The sworn testimony was given under oath in court.
• She is a sworn enemy of corruption in government.
• The witness had sworn to tell the truth.
• They became sworn allies after the treaty was signed.
• He was a sworn officer of the law.
• The two families were sworn enemies for generations.
• I have sworn never to reveal the secret.