A more thorough explanation:

Definition: Nullum fecerunt arbitrium is a Latin term that means "they never submitted to arbitration." It is used in legal cases where the defendant denies that there was an arbitration in an action to enforce an arbitration award.

Example 1: In a dispute between two parties, they agreed to submit their case to an arbitrator. However, one party refused to participate in the arbitration process. In this case, the defendant can use the plea of nullum fecerunt arbitrium to deny that there was an arbitration.

Example 2: A company and its employee had a disagreement over the terms of the employment contract. They decided to settle the dispute through arbitration. However, the employee later claimed that the arbitration was not fair and refused to abide by the decision. In this case, the company can use the plea of nullum fecerunt arbitrium to deny the employee's claim.

These examples illustrate how nullum fecerunt arbitrium can be used in legal cases where one party denies that there was an arbitration. It is a defense that can be used to challenge the validity of an arbitration award.