合あい釘くぎ

noun

double-pointed nail; dowel

A nail or pin with points at both ends, used to join two pieces of wood together; also refers to a dowel used in joinery.

• 合あい釘くぎで二に枚まいの板いたをしっかりと接せつ合ごうした。

  I joined the two boards firmly with a double-pointed nail.

• この家か具ぐは合あい釘くぎを使つかって組くみ立たてられている。

  This piece of furniture is assembled using dowels.