Wiktionary
n. (context banking English) A reversal of an accounting entry, especially of a disputed credit card transaction.
Wikipedia
Chargeback is the return of funds to a consumer, mainly used in the United States, forcibly initiated by the issuing bank of the instrument used by a consumer to settle a debt. Specifically, it is the reversal of a prior outbound transfer of funds from a consumer's bank account, line of credit, or credit card.
Chargebacks also occur in the distribution industry. This type of chargeback occurs when the supplier sells a product at a higher price to the distributor than the price they have set with the end user. The distributor then submits a chargeback to the supplier so they can recover the money lost in the transaction.