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.
He failed again and again.
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'.