two by four

Canada US dated

(chiefly Canada, US) A length of sawn wood of cross section approximately 2 inches by 4 inches, most often employed as structural framing lumber (dimension or dimensional lumber).

Japanese Meaning

主に米国およびカナダで用いられる、断面が約2インチ×4インチの角材（構造用枠組み材）

What is this buttons?

He slammed a two by four across the beams to create a makeshift brace during the renovation.

Google Translation / DeepL Translation

彼は改装中に仮の補強として梁の上に断面約2インチ×4インチの木材を打ち付けた。

Details

Sense（1）

(chiefly Canada, US) A length of sawn wood of cross section approximately 2 inches by 4 inches, most often employed as structural framing lumber (dimension or dimensional lumber).