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.
DR means Debit. And after your bank statement balance it means that you have a debit balance instead of a credit balance which means that you are overdrawn.Source(s): Accounting Major, have performed bank reconciliations (check book balance vs bank statement balance). J-Luv The Bunny Â· 8 years ago.nd after your bank statement balance it means that you have a debit balance instead of a credit balance which means that you are overdrawn. Source(s): Accounting Major, have performed bank reconciliations (check book balance vs bank statement balance). J-Luv The Bunny Â· 8 years ago.