尻尾を掴む
1
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
Other forms
尻尾をつかむ 【しっぽをつかむ】 · しっぽを掴む 【しっぽをつかむ】 (search-only kanji form)