get (something) sewn up

1. To successfully conclude or settle some agreement or negotiation. I was finally able to get the contracts with the other firm sewn up. There are still a few outstanding issues to resolve, but we should be able to get the deal sewn up by the end of the week. Don't worry, I've gotten everything sewn up for our vacation. All you have to do is get ready for a week of relaxation!

2. To gain total control or domination over something. There have been a few rival companies here and there, but most would agree that Flimtendo got the video game market sewn up years ago. With a goal in the last two minutes, the team has gotten the game all but sewn up. A: "Wouldn't it be nice to go into the ninth inning with a comfortable lead for once?" B: "Right? We don't have to get a win sewn up at the last second every night!"