1. a sturdy metal container with a lock, used for storing valuable items or documents

Examples

• The family kept their important documents in a fireproof strongbox.
• She stored her grandmother’s jewelry in the strongbox under her bed.
• The bank manager opened the strongbox to retrieve the customer’s valuables.
• After the burglary, they decided to invest in a heavy-duty strongbox.
• The old strongbox contained vintage coins and rare stamps.
• He carried the portable strongbox to the new office location.