noun
underpinning; splicing a rotting post
Architectural term for repairing or reinforcing the base of a wooden post or pillar, often by splicing a new piece onto the rotted bottom.
古い寺院の柱に根継ぎを施して、腐った部分を補強した。
They performed underpinning on the pillars of the old temple, reinforcing the rotted sections.
Compound of 根 (ne, 'root, base') and 継ぎ (tsugi, 'splicing, joining'), referring to the technique of joining a new piece to the base of a post.