re-affirm (v.)youdaoicibaDictYouDict[re-affirm 词源字典]
also reaffirm, 1610s, "to confirm anew," from re- "back, again" + affirm. Meaning "to assert anew" is recorded from 1842. Related: Reaffirmed; reaffirming.[re-affirm etymology, re-affirm origin, 英语词源]