rehash

[v. ree-hash; n. ree-hash]
verb (used with object)
1.
to work up (old material) in a new form.
noun
2.
the act of rehashing.
3.
something rehashed.

Origin:
1815–25; re- + hash

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
rehash
 
vb
1.  (tr) to rework, reuse, or make over (old or already used material)
 
n
2.  something consisting of old, reworked, or reused material
 
[C19: from re- + hash1 (to chop into pieces)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

rehash
1822, from re- "again" + hash (v.). The noun is first attested 1849.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The packaging was good, but much of the content was a rehash of old promises.
Let me know if this is a rehash or of better reference.
It's nothing but a rehash of the same failed ideas he's already tried, combined
  with a huge tax increase.
They're proposing a rehash of what's already been tried: more spending, more
  taxes and bigger government.
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