How to pronounce AFFIDAVIT. How to say AFFIDAVIT.A written declaration upon oath made before an authorized official. "affidavit". Listen to the audio pronunciation again. Having trouble hearing a pronunciation? The term is pronounced as "afuhDAYvit. " Breaking it down: "af" as in "after," "uh" as in "umbrella," "DAY" with emphasis, and "vit" rhymes with "fit." How to say affidavit in English? Do you have to fill out an Affidavit Disclosing Care or Custody? Sometimes it helps to have someone fill it out with you.