Meaning of 根城 in Japanese
Definition of 根城
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(n) stronghold; citadel; headquarters
泥棒は、間違いなくここにいるはずよ。きっと、どこかに根城があるから、そこを見つけさえすればいいの。
The thief has to be in here. I'm sure somewhere around is his stronghold so if we can just find that we've got him.