To finalize and secure an agreement or transaction; to complete negotiations successfully and make them binding.
This phrase combines the ancient practice of using wax seals to authenticate important documents with modern business terminology. 'Seal' implies permanence and authority, while 'deal' represents the informal American approach to business agreements, creating a phrase that's both official and accessible.
Unlike 'close the deal,' which focuses on completion, 'seal the deal' emphasizes security and permanence - it's not just finished, it's locked down. The imagery suggests something so secure that it would require breaking a seal to undo, adding gravity to business agreements.
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