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.
He wasn't confident in his answer, so he re-examined it many times.