裏うら釘くぎ

noun

nail sticking through; protruding nail

Refers to a nail that has been driven through a board and its point is sticking out the other side. A technical term in woodworking and carpentry.

• 裏うら釘くぎが出でているので、金かな槌づちで叩たたいて曲まげてください。

  The nail is sticking through, so please hammer it down and bend it.

• この板いたの裏うら側がわには裏うら釘くぎが何なん本ぼんも見みえる。

  On the back side of this board, you can see several protruding nails.