Source : Webster's Revised Unabridged Dictionary (1913)

Cracksman \Cracks"man\ (kr?ks"man), n., pl. {Cracksmen} (-men).
   A burglar. [Slang]

Source : WordNet®

cracksman
     n : a thief who breaks open safes to steal valuable contents
         [syn: {safebreaker}, {safecracker}]