v become fractured; break or crack on the surface only v make a very sharp explosive sound v make a sharp sound v hit forcefully; deal a hard blow, making a cracking noise v pass through (a barrier) v break partially but keep its integrity v break suddenly and abruptly, as under tension v gain unauthorized access computers with malicious intentions v suffer a nervous breakdown v tell spontaneously v cause to become cracked v reduce (petroleum) to a simpler compound by cracking v break into simpler molecules by means of heat s used of skin roughened as a result of cold or exposure s of paint or varnish; having the appearance of alligator hide s informal or slang terms for mentally irregular