expression, godan verb (-su)
plant oneself; settle in
Used when someone stays in a place for a long time, often with a nuance of being unwilling to leave or becoming a fixture.
彼はカフェに根を生やして、何時間も居座った。
He planted himself in the café and stayed for hours.
expression, godan verb (-su)
take root; become established
Describes something like a religion, custom, or idea becoming firmly established in a place or community.
キリスト教はこの地域に根を生やしている。
Christianity has taken root in this region.