From Longman Dictionary of Contemporary Englishbeef something ↔ up phrasal verb informalIMPROVEto improve something or make it more interesting, more important etc a beefed-up news story We need to beef the campaign up. → beef→ See Verb table
Examples from the Corpus
beef up• It was, he thought, the look of her, guaranteed to beef you up.• Most of the beef exported ends up as hamburgers, pet food, processed meats and baby foods.• Squire's Choice - sliced roast beef rolled up with a filling of pickled red cabbage and horseradish sauce. 3. 