What mean defalt?

Do you mean DEFAULT?

In finance, default occurs when a debtor has not met its legal obligations according to the debt contract, e.g. it has not made a scheduled payment, or violated a loan covenant (condition) of the debt contract. Default may occur if the debtor is either unwilling or unable to pay their debt. This can occur with all debt obligations including bonds, mortgages, loans, and promissory notes.

The term default should be distinguished from the terms insolvency and bankruptcy. "Default" essentially means a debtor has not paid a debt. "Insolvency" is a legal term meaning that a debtor is unable to pay his debts. "Bankruptcy" is a legal finding that imposes court supervision over the financial affairs of those who are insolvent or in default