大おお釘くぎ

noun

spike; very large nail

Civil engineering term for a large nail or spike, used in heavy construction such as timber framing, railway ties, or bridge building.

• 橋はしの工こう事じで、大おお釘くぎを使つかって木もく材ざいを固こ定ていした。

  During the bridge construction, they used spikes to secure the timber.