Something reworked, or made up from old materials.
He wrote a bad rehash of an earlier essay.
A recomputation of the structure of a hash table, taking into account any newly added items.
To repeat with minor variation.
The CEO of the company only rehashed a speech for the news conference.
To analyze a prior contentious or embarrassing event.
Let's not rehash what we did last night.
To recompute the structure of a hash table, taking into account any newly added items.