しっぽをつかむ
尻尾を掴む
to have something on someone; to catch someone out; to trip someone up; to find someone's fault; to get evidence on someone; to get a lead on someone; to grab by the tail
N3Expression
Expression, Godan verb (mu ending)
to have something on someone•to catch someone out•to trip someone up•to find someone's fault•to get evidence on someone•to get a lead on someone•to grab by the tail