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rehash (v.)

"work up (as old material) in a new form," 1822, from re- "again" + hash (v.). Related: Rehashed; rehashing.

rehash (n.)

"old material worked up anew, something concocted from material formerly used," usually of literary productions, 1849, from rehash (v.).

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Definitions of rehash from WordNet
1
rehash (v.)
present or use over, with no or few changes;
rehash (v.)
go back over;
Synonyms: retrograde / hash over
2
rehash (n.)
old material that is slightly reworked and used again;
merely a dull rehash of his first novel
From wordnet.princeton.edu