noun
twofold and threefold; doubled and redoubled
Emphasizes multiple layers or repeated intensification, often used figuratively for troubles, precautions, or blessings that pile up.
彼の失敗は二重三重のミスが重なった結果だ。
His failure was the result of multiple mistakes piling up.
二重三重
We need to take doubled and redoubled safety measures.