There are several synonyms for the word "repropagate" that can be used depending on the context of the sentence. A few options include "reproduce", "replicate", "spread again", "recreate", "reestablish", and "regenerate". These synonyms all imply the idea of reproducing something that has already existed or spread before. "Reproduce" and "replicate" emphasize the repetition of an exact copy, while "recreate" and "regenerate" suggest more of a renewal or rejuvenation. "Spread again" and "reestablish" emphasize the idea of something being extended or returned to its former state. Regardless of which synonym is used, they all convey the general concept of creating something that has already been created or spread before.