walk off with (something)
1. To win easily. Our opponents walked off with a victory because we were so unprepared for that game.
2. To steal something. Someone at the party must have walked off with my purse because I can't find it anywhere.
walk off with
1. Also, walk away with. Win easily, as in Our team walked off with the pennant, or He expected a tough opponent, but to his surprise he walked away with first place. [First half of 1800s]
2. Steal, as in Someone walked off with my suitcase. [Early 1700s]