Double check is a phrase used to describe an act of verifying something for accuracy and correctness. There are various synonyms for double check that one can use to convey the same meaning or message. Some of the synonyms to double-check are re-examine, confirm, authenticate, validate, scrutinize, cross-validate, vet, verify, authenticate, and cross-check. Re-examine suggests a thorough search for flaws or errors in something that has already been checked. Confirm implies to verify or prove the authenticity of something or someone, while validate means to establish the credibility or accuracy of a measurement, test, or analysis. Overall, these synonyms provide different ways of delivering the same message, and they offer a more precise and effective way of communication.