From Longman Dictionary of Contemporary Englishwalk off with something phrasal verb informal1 to win something easily Lottery winners can walk off with a cool £18 million.2 stealto steal something or take something that does not belong to you Thieves walked off with two million dollars’ worth of jewellery. → walk→ See Verb table
Examples from the Corpus
walk off with • It makes the software easier to display and harder to walk off with.• Maybe she'd win the pools or walk off with first prize in the national lottery!• He then walked off with it.• And the added bulk helped deter customers from walking off with the product without paying.• Each had worried that the other might walk off with the remainder of the story by himself. 