a written statement that you swear is true, and that can be used as evidence in court 宣誓书；宣誓陈述书 to make/swear/sign an affidavit 作书面保证；立宣誓书；签署宣誓书 They swore affidavits and put further material before the court. 他们宣誓宣誓，并向法庭提交了进一步的材料。
Word Originmid 16th cent.: from medieval Latin, literally ‘he has stated on oath’, from affidare.