Definition of rehash verb from the Oxford Advanced Learner's Dictionary
rehash
verb
ˌriːˈhæʃ ˌriːˈhæʃ
rehash something (disapproving) to arrange ideas, pieces of writing or pieces of film into a new form but without any great change or improvementHe just rehashes songs from the 60s.rehash
ˈriːhæʃ ˈriːhæʃ
noun[singular]: (disapproving) The movie is just a rehash of the best TV episodes.