Definify.com

Webster 1913 Edition

(r?-h?sh′)

Verb.

To hash over again; to prepare or use again;

as, to

rehash

old arguments

Noun.

Something hashed over, or made up from old materials.

rehash ‎(third-person singular simple present rehashes, present participle rehashing, simple past and past participle rehashed)

(transitive) To rework old material (physical material, ideas, documents etc), redo some work, with some variations.

Today's parliamentary session only rehashed last week's arguments.

The CEO of the company only rehashed a speech for the news conference.

The general rehashed plans for the war.
(transitive, computing) To recompute the structure of a hash table, taking into account any newly added items.

to rework old material, redo some work, with some variations

rehash ‎(plural rehashes)

Something reworked, or made up from old materials.
He wrote a bad rehash of an earlier essay.
(computing) A recomputation of the structure of a hash table, taking into account any newly added items.

something reworked, or made up from old materials