"Old one-twos" is a slang term for a tactic in boxing where a boxer throws a left jab or hook followed by a right cross. The term "old" may suggest that this tactic is outdated or unoriginal. Therefore, antonyms for "old one-twos" could include innovative combinations, unconventional moves, or modern techniques. These antonyms could refer to boxing techniques such as the drop step, slip, uppercut, or feint, which have gained popularity in recent years. By incorporating these fresh techniques, boxers could gain an advantage over their opponents and demonstrate their creativity and versatility in the ring.