To fill up or replace supplies that have been used or sold, like refilling a store shelf with new products.
From 're-' meaning 'again' plus 'stock,' which comes from Old English and Old German roots meaning 'log' or 'supply.' The term became common in retail and inventory management.
Modern grocery stores restock shelves overnight so customers see full shelves, but during supply chain crises like the pandemic, people discovered just how thin that buffer really is—many stores couldn't restock fast enough.
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