To have something all sewn up

Meaning

To have a situation completely under control or its outcome assured.

Origin

The phrase "to have something all sewn up" draws its vivid imagery from the world of tailoring and dressmaking. When a garment is literally "sewn up," it signifies the completion of the work; every seam is closed, every piece joined, and the item is finished, secure, and ready. There is no doubt about its state or perfection. This practical act of finishing and securing a piece of fabric through precise stitching became a compelling metaphor. It transitioned from the craftsperson's workshop into everyday language to describe any situation, plan, or competition that is so thoroughly managed and controlled that its ultimate success or outcome is no longer in question – it is definitively complete and assured.

Examples

After months of intense negotiations, the merger deal was finally all sewn up, much to the relief of both companies.
She had the championship all sewn up from the start, consistently outperforming her rivals in every round.