[noun A] + に + [noun A/B] + を重ねて
Note: Typically the same noun is repeated (A に A を重ねて) to emphasize accumulation. Common nouns: 努力、研究、議論、苦労、工夫、失敗、練習、検討
The grammar pattern に~を重ねて expresses the idea of doing something repeatedly and cumulatively – piling one effort or action on top of another. It conveys that through persistent, sustained repetition of the same kind of effort, a result was eventually achieved. It is often translated as "through repeated ~", "by ~ upon ~", or "after continuous ~".
The pattern typically uses the same noun twice (or two closely related nouns) to emphasize accumulation:
The most common nouns with this pattern include:
This pattern carries a formal, literary tone and is commonly found in written Japanese, speeches, and news articles. It emphasizes the weight and accumulation of sustained action, often implying hardship or perseverance. The result clause that follows typically describes an achievement, a breakthrough, or sometimes a negative outcome after repeated failures.
A simpler related form is [noun]を重ねて, which means "through accumulated ~" without the doubled emphasis:
The に~を重ねて form is more emphatic, stressing that the action was done again and again without stopping.