from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
- n. The indentation left by such a tool.
- v. To prepare a workpiece for drilling by using a centerpunch to create an indentation.
- v. To place something directly in the middle.
From center + punch (Wiktionary)
For a centerpunch to mark the spots for the drill to bite, there are punches made just for the purpose: different diameter shafts with the punch point in the center.