A more thorough explanation:

Definition: Calumnia is a term used in Roman law to describe vexatiously instituted civil proceedings or knowingly false criminal charges made against someone.

For example, if someone falsely accuses another person of a crime they did not commit, that would be considered calumnia. The victim of calumnia has civil or criminal remedies depending on the circumstances.

Another example of calumnia could be a frivolous lawsuit filed against someone with the intention of causing them harm or inconvenience.

These examples illustrate how calumnia involves making false accusations or vexatiously instituting legal proceedings against someone, with the intention of causing harm or inconvenience.