くぎkugi
1.

A small, pointed metal or wooden piece used to fasten objects together by being hammered into them, often employed in construction or hanging items.

2.

An item with a sharpened end, driven into a surface to secure or attach other materials, essential in carpentry and various types of assembly work.

3.

A fastener characterized by a pointed tip, utilized to connect two or more objects, which can indicate a lack of attention to detail if missing from a crucial position.

Example:

その板にを打ってください。

くぎづ釘付kugizukeくぎkugiづけzukeくぎkugizuke
1.

The act of fixing something firmly in place, preventing it from moving, often through physical means such as driving a nail into it.

2.

A state of feeling immobilized or unable to move from a specific spot, often due to overwhelming emotions such as fear or fascination.

3.

The condition of being unable to divert one's attention or gaze from something, indicating a deep engagement or concentration on that specific object or scene.

Example:

今夜はとてもおもしろい番組があるから、テレビの前にくぎづけだろう。

ごすんくぎ五寸釘gosunkugi
1.

A type of long nail that is typically around six centimeters in length, often used in traditional Japanese carpentry and construction.

2.

A larger-sized nail, specifically one that measures five sun (approximately fifteen centimeters), utilized for securing heavier materials or in structural applications.

ねじnejiくぎkugi
1.

A type of fastener that is characterized by a helical ridge, used to join objects together by being driven into them.

2.

A metallic pin with a spiraled thread that provides a secure hold when inserted into materials such as wood or metal.

3.

A construction element designed for creating a strong bond between surfaces by allowing rotational force to anchor it firmly in place.