A more thorough explanation:

IN DUPLO

in duplo (in d[y]oo-ploh), adv. & adj. [Law Latin] Historically, it means "in double." This term was used in phrases such as "damna in duplo" which means "double damages." It was also used in Roman law as "in duplum."

1. The court ordered the defendant to pay the plaintiff "damna in duplo" for the damages caused.

2. The Roman law stated that if someone caused harm to another person's property, they would have to pay "in duplum" of the value of the property.

The examples illustrate the use of the term "in duplo" in legal contexts. In the first example, the court ordered the defendant to pay double the amount of damages caused to the plaintiff. In the second example, the Roman law required the person who caused harm to pay twice the value of the property they damaged. These examples show how the term "in duplo" was used to indicate double the amount of something in legal proceedings.