- Old English cracian 'make an explosive noise'; of Germanic origin; related to Dutch kraken and German krachen.
: a sudden sharp or explosive noise
<a loud crack of thunder>
: a sharp audible blow
<she gave the thief a crack over the head with her rolling pin>
crack. (2013). In Oxford Online Dictionary.
Retrieved March 14, 2013, from http://oxforddictionaries.com/definition/english/crack?q=crack