Wordnet 3.0
NOUN (1)
1.
a tool with a conical point that is used to make indentations in metal (especially to mark points for drilling);
VERB (1)
1.
make a small hole in something as a guide for a drill;
The Collaborative International Dictionary of English v.0.48:
Center punch \Center punch\, or Centre punch \Centre punch\
(Mech.)
(a) A punch for making indentations or dots in a piece of
work, as for suspension between lathe centers, etc.
(b) A punch for punching holes in sheet metal, having a
small conical center to insure correct locating.
[Webster 1913 Suppl.] Center seal
WordNet (r) 3.0 (2006):
center punch
n 1: a tool with a conical point that is used to make
indentations in metal (especially to mark points for
drilling)
v 1: make a small hole in something as a guide for a drill