Entry 2 senses · 2 variants Webster, 1913 Rehash /(r?*h?sh")/ · Re·hash · IPA /ɹiːˈhæʃ/ v. t. n. 01 v. t. To hash over again; to prepare or use again; as, to rehash old arguments. 1. To hash over again; to prepare or use again; as, to rehash old arguments. 02 n. Something hashed over, or made up from old materials. 1. Something hashed over, or made up from old materials.