角かく釘くぎ

noun

square nail; square peg

Refers to a nail or peg with a square cross-section, used in traditional woodworking and construction. The 'square peg' gloss is a direct translation but less common in everyday English; the primary meaning is a square nail.

• 古ふるい建たて物ものの修しゅう理りには角かく釘くぎが使つかわれることがある。

  Square nails are sometimes used in the repair of old buildings.