7

I did not find any resources explaining the following grammar.

N に N を V

For example,

調査に調査を重ねて事故の原因を究明した。

What kind of grammar is it? What does it mean?

  • 1
    I think the grammar question’s been adequately answered below, but as a translation, I might go with something like “They searched after the cause of the accident, piling investigation on investigation.” – David Moles Dec 13 '16 at 22:45
  • @DavidMoles Oh, do you have such an expression in English too? That's great! Btw I think I'd say "searched out" rather than "searched after". – broccoli forest Dec 14 '16 at 1:09
  • @broccoliforest We do! And I wasn't excited about "searched after". I think "sought out" or even just "sought" might be more natural. – David Moles Dec 14 '16 at 18:00
10

X に X を重ねる (lit. to pile up X (further) onto X)

is an idiomatic phrase to mean "doing X extensively, or unthinkably many times over", usually X is a noun that means some kind of (hard) work.

I also often hear:

研究に研究を重ねる
努力に努力を重ねる
改良に改良を重ねる etc.

7

「N に N を V」 when the verb is 「重{かさ}ねる」

means:

"to do/make one N after another" or

"to do/make N repeatedly"

「調査{ちょうさ}に調査を重ねる」 thus means "to conduct one investigation after another".

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