They felt they 'had' the win/game 'sewn up'. [=they felt that they were certainly going to win]
She designs her own dresses and 'sews' in her free time.
He scored a touchdown that 'sewed up' the win/game.
(..) -Surprise! AII that's over, starting today. Why? My kid sister don't have to work in no beauty parIour, and Mama... she don't have to sew in no factory. Your son made it, Mama. He's a success. That's why I didn't come around before. I want you to see (..)1983 Scarface