Mainly used in British English, may not be understood internationally. Use with British audiences. She agreed to the deal and paid on the nail.
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Historical Business
Originally from old trading practices, where deals were finalized by hitting a nail. Resonates in business contexts. After the handshake, the payment was made on the nail.
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Figurative Meaning
Not about actual nails. Implies doing something promptly, can describe payments or decisions. Once the terms were clear, we decided on the nail.