noun, noun or participle which takes 'suru', transitive verb
failing to recognize someone
Used when you don't realize who someone is, often in the set phrase お見それしました (I didn't recognize you).
お見それしました。田中さんでしたか。
I didn't recognize you. So it was Mr. Tanaka.
noun, noun or participle which takes 'suru', transitive verb
underestimating someone's ability; not realizing someone's skill
Used when you fail to appreciate someone's true ability or worth, often in the phrase お見それしました (I underestimated you).
あの若者がこんなにできるとは、お見それしました。
I underestimated that young person; I didn't realize they were so capable.