Definition of ironclad. 1  1 : sheathed in iron armor âused especially of naval vessels. 2  2 : so firm or secure as to be unbreakable: such asa : binding an ironclad oathb : having no obvious weakness an ironclad case against the defendant.
Best Answer: CR means a credit. If this appears on the balance due line of your statement, it means that you owe nothing and that you are that much ahead of future charges and no payment or acknowledgment is needed.
Common Reporting Standard. The Common Reporting Standard (CRS), formally referred to as the Standard for Automatic Exchange of Financial Account Information, is an information standard for the automatic exchange of information (AEoI), developed in the context of the Organisation for Economic Co-operation and Development (OECD).