noun
baseboard; skirting board
A board covering the joint between a wall and the floor; used in construction and interior design.
壁と床の間に幅木を取り付ける。
Install a baseboard between the wall and the floor.
Compound of 幅 (はば, 'width') and 木 (き, 'wood'), referring to a wooden board placed along the width of a wall base.