Frozen Account

An account to which no withdrawals or purchases can be charged. This usually occurs when the account holder fails to pay promptly for purchases charged to the account. For example, cash accounts are frozen for 90 days until the full purchase price of the intended order is paid in full.

Investopedia Says:
In other words, when your bank account is frozen, it's because you owe money to someone. Any creditor that has a judgment against you can have your bank account frozen. The creditor can actually freeze your account for up to twice the amount you owe. If you receive a notice from your bank stating that your account has been frozen, look for the lawyer and phone number that is listed on the notice. If you didn't receive a notice after your account was frozen, call your bank and ask for the lawyer's name and phone number so you can settle the account.

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Banking: bank account from which funds may not be withdrawn until a lien is satisfied and a court order is received freeing the balance.

A bank account may also be frozen by court order in a dispute over the ownership of property.

Investments: brokerage account under disciplinary action by the Federal Reserve Board for violation of Regulation T. During the period an account is frozen (90 days), the customer may not sell securities until their purchase price has been fully paid and the certificates have been delivered. The penalty is invoked commonly in cases of Freeriding.