There are a plethora of synonyms for the phrase "affirm once more". These include reassert, reiterate, restress, repeat, restate, reaffirm, confirm, and reconfirm. Reassert means to state something again, usually with more force or emphasis. Reiterate means to say something again, in order to emphasize it or make it more clear. Restress means placing emphasis again on something that has already been emphasized. Repeat means to say something again without any changes. Restate means to express something in a different way, usually to make it more clear. Reaffirm means to assert or confirm again. Confirm means to make sure that something is true, accurate or genuine. Lastly, reconfirm means to confirm once again.