adverb taking the 'to' particle, adverb, noun
Emphasizes that something happens multiple times, often with a sense of persistence or annoyance. Commonly used with the particle と.
彼は二度三度と失敗を繰り返した。
He failed again and again.
二度三度の注意にもかかわらず、彼は同じ
Despite being warned repeatedly, he made the same mistake.
Compound of 二度 (twice) and 三度 (three times), literally 'two times, three times', used idiomatically to mean 'repeatedly'.