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getting information (esp. by interviewing witnesses, etc. in a police investigation)
刑事は聞き込みをした。
The detective conducted inquiries.
警察は近隣住民への聞き込みを続けている。
The police are continuing their inquiries with local residents.
事件の聞き込みには時間がかかった。
The inquiries into the case took a long time.