1) Cannibalise 2) Go over 3) Iterate 4) Redo 1) Cover old ground 2) Cover old territory 3) Cross-dressing in television 4) Discuss again 5) Discuss over and over 6) Discuss tiresomely 7) Discuss to death 8) Go back over 9) Go down memory lane 10) Go over 11) Go over again 12) Go over again and again 13) Go over and over 14) Go over and over again 
• (v. t.) To hash over again; to prepare or use again; as, to rehash old arguments. • (n.) Something hashed over, or made up from old materials.
Re·hash' noun Something hashed over, or made up from old materials. Re·hash' transitive verb To hash over again; to prepare or use again; as, to rehash old arguments. 
[n] - old material that is slightly reworked and used again 2. [v] - present or use over, with no or few changes 3. [v] - go over once again
noun old material that is slightly reworked and used again; `merely a dull rehash of his first novel`