A more thorough explanation:

A cumulative remedy is a legal remedy that is available to a party in addition to another remedy that still remains in force. A remedy is anything a court can do for a litigant who has been wronged or is about to be wronged. The two most common remedies are judgments that plaintiffs are entitled to collect sums of money from defendants and orders to defendants to refrain from their wrongful conduct or to undo its consequences.

For example, if a person is injured in a car accident, they may seek both monetary damages and an injunction to prevent the other driver from driving recklessly in the future. The monetary damages would be a legal remedy, while the injunction would be an equitable remedy. Both remedies can be pursued simultaneously, and the injured party can receive both if they are successful in their case.