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To Settle In
To Take A Seat, To Take A Position
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means settle in. The verb vocab version is to settle in.
Try to settle in to this life. Wow, you are too (つ) settled in now, don't get too comfortable.
Why do you want to take a position at a company that pays you per diem?