1. past tense of forswear; to renounce, reject, or promise to give up something
Usage: transitive verb; formal or literary
2. past tense of forswear; to swear falsely; to commit perjury
Usage: transitive verb; archaic or legal

Examples

• She foreswore her claim to the inheritance.
• He foreswore alcohol after his recovery began.
• The knight foreswore violence and became a monk.
• They foreswore all ties to their former organization.
• He foreswore himself in court and was charged with perjury.
• The candidate foreswore negative campaigning during the election.