godan verb (-su)
re-examine; review; recheck
Used when checking something again, often to verify accuracy or find missed details. Implies a second look at information, documents, or facts.
間違いがないか、もう一度資料を調べ直してください。
Please recheck the documents once more to make sure there are no mistakes.
彼は自分の答えに自信がなくて、何度も調べ直した。
He wasn't confident in his answer, so he re-examined it many times.