1. to sign a document that has already been signed by another person to confirm or authenticate it

1. a secret word or phrase that must be given to pass a guard or checkpoint
Usage: military
2. a signature added to a document to authenticate or confirm it

Examples

• The treasurer must countersign all checks over $500.
• Both the manager and the accountant need to countersign the contract.
• The soldier gave the countersign to pass through the checkpoint.
• Without the proper countersign, entry to the base was denied.
• The document requires a countersign from the department head.
• The bank required a countersign on the large withdrawal.
• Guards at the gate demanded the daily countersign.