A more thorough explanation:

Term: pro falso clamore suo
Definition: When someone makes a false claim in court, they may have to pay a fine called a nominal amercement. This fine is given to the defendant as part of the judgment.
Example: If someone sues their neighbor for stealing their cat, but it turns out the cat was just hiding under the bed, the neighbor could ask for pro falso clamore suo. This means the person who made the false claim would have to pay a fine for wasting everyone's time and making a false accusation. This fine is meant to discourage people from making false claims in court.