expression, godan verb (-ru)
spread roots; take root (of plants)
Literal use for trees and plants extending their roots into the ground.
この木は深く根を張っている。
This tree has spread its roots deep.
expression, godan verb (-ru)
take root; become established; settle down
Figurative use: an idea, custom, or person becomes firmly established in a place or society. Sense 3 specifically refers to people settling down.
民主主義がこの国に根を張るまでには時間がかかった。
It took time for democracy to take root in this country.
彼は東京に根を張って、もう20年になる。
He put down roots in Tokyo and has been there for 20 years now.