1. to sign (a document) in addition to another’s signature to confirm or authenticate it

1. secret words or signals used for identification, especially by military personnel
Usage: military

Examples

• The treasurer countersigns all checks over $500.
• Both the president and secretary must countersign the contract.
• The guard asked for the countersign before allowing entry.
• Soldiers were given new countersigns each night.
• The bank manager countersigns large withdrawal requests.
• Without the proper countersign, access was denied.
• She countersigns documents as part of her supervisory duties.