Re-identifying someone or something refers to the act of establishing or confirming their identity, either after they have been lost or forgotten. There are a few synonyms that can be used to describe this process of reidentification. The term "re-recognize" is one of the most common synonyms for reidentify, suggesting the restoration of a prior identity or recognition. Other potential synonyms include "reestablish," "revalidate," and "reconfirm," all of which describe some aspect of verifying or confirming a previously known identity. Ultimately, the choice of word will depend on the context and intended meaning of the phrase.