rehash

Etymology

re- + hash

verb

1. (transitive) To hash (chop food into small pieces) again.
   I never did care for Sunday joint that was served up cold on Monday, hashed on Tuesday, rissoled on Wednesday, and re-hashed on Thursday[.] 1 July 1942, The Newcastle and Maitland Catholic Sentinel, Newcastle, NSW, page 224, column 2
2. (transitive) To repeat with minor variation.
   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.
3. (transitive) To analyze a prior contentious or embarrassing event.
   Let's not rehash what we did last night.
4. (transitive, computing) To recompute the structure of a hash table, taking into account any newly added items.

noun

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