When it comes to describing the act of rejuvenating something or injecting new energy or enthusiasm, there are numerous synonyms for the phrase "putting new life into". Some commonly used expressions include "reinvigorating", "revitalizing", "refreshing", "re-energizing", and "rejuvenating". Other similar expressions such as "giving a new lease of life", "breathing new life into", and "infusing with fresh energy" can also be used to convey the same meaning. Whatever the context, these synonyms can help to add depth and richness to your language, helping you to express yourself with greater precision and clarity.