Definition of "Crack" :
noun: the act of cracking something
noun: a usually brief attempt
"He took a crack at it."
noun: a purified and potent form of cocaine that is smoked rather than snorted; highly addictive
noun: a narrow opening
"He opened the window a crack."
noun: a blemish resulting from a break without complete separation of the parts
"There was a crack in the mirror."
noun: witty remark
noun: a sudden sharp noise
"The crack of a whip."
noun: a long narrow opening
noun: a long narrow depression in a surface
noun: a chance to do something
verb: break into simpler molecules by means of heat
"The petroleum cracked."
verb: reduce (petroleum) to a simpler compound by cracking
verb: become fractured; break or crack on the surface only
"The glass cracked when it was heated."
verb: cause to become cracked
"Heat and light cracked the back of the leather chair."
verb: break suddenly and abruptly, as under tension
verb: break partially but keep its integrity
"The glass cracked."
verb: pass through (a barrier)
"Registrations cracked through the 30,000 mark in the county."
verb: tell spontaneously
"Crack a joke."
verb: hit forcefully; deal a hard blow, making a cracking noise
"The teacher cracked him across the face with a ruler."
verb: suffer a nervous breakdown
verb: make a sharp sound
verb: make a very sharp explosive sound
"His gun cracked."
verb: gain unauthorized access computers with malicious intentions
"She cracked my password."
adjective: of the highest quality
"A crack shot."