centerpunch

1. noun

a) A hand tool used to prepare a workpiece prior to drilling a hole. It typically compresses and then suddenly releases a spring, creating a small indentation that, in turn, guides and centers the drill.

b) The indentation left by such a tool.

2. verb

a) To prepare a workpiece for drilling by using a centerpunch to create an indentation.

b) To place something directly in the middle.