What is the meaning of Rehash?

To hash (chop food into small pieces) again.

To repeat with minor variation.

To analyze a prior contentious or embarrassing event.

To recompute the structure of a hash table, taking into account any newly added items.

Something reworked, or made up from old materials.

A recomputation of the structure of a hash table, taking into account any newly added items.

Source: wiktionary.org