A more thorough explanation:

Inficiari is a Latin term that means "to deny." In Roman law, it refers to the act of denying a plaintiff's allegation, particularly in regards to denying liability on a debt.

For example, if a creditor sues a debtor for non-payment of a debt, the debtor may inficiari by denying that they owe the debt in question. Similarly, if a plaintiff alleges that a defendant caused them harm, the defendant may inficiari by denying that they were responsible for the harm.

Another example could be a defendant in a criminal case inficiari by denying that they committed the crime they are accused of.

The examples illustrate how inficiari is used in Roman law to deny allegations made by a plaintiff or accuser. It is a way for the defendant to challenge the plaintiff's case and avoid liability or punishment. Inficiari is an important legal concept that is still relevant today in many legal systems around the world.