1) Affirm 2) Affirm once again 3) Assert again 4) Assert anew 5) Declare again 6) French word used in English 7) Reconfirm 8) Restate 9) State again as fact 10) To affirm again 11) To bolster or support 12) Validate again Found on https://www.crosswordclues.com/clue/reaffirm