I did not find any resources explaining the following grammar.

N に N を V

For example,


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". – broken laptop 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

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:

改良に改良を重ねる etc.


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


"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".


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.