There are several synonyms for the phrase "old lines," which is commonly used to describe outdated or obsolete practices. Some possible alternatives include "antiquated methods," "obsolete strategies," "outmoded techniques," "dated processes," and "archaic approaches." Each of these phrases indicates something that is no longer effective or relevant in today's world, whether in business, technology, or social norms. Choosing the right synonym depends on the context of the conversation or writing in which it is used, as well as the intended tone and level of formality. Regardless of the choice, all of these phrases suggest a need for change and innovation in order to keep up with the times.