# noun. - a line on the surface of something along which it has split without breaking into separate parts. * a hairline crack down the middle of the glass - a sudden sharp or explosive noise. * a loud crack of thunder - a joke, typically a critical or unkind one. * he knew about the gossip and would make the odd crack - an attempt to gain or achieve something. * I thought I had a crack at winning - a hard, crystalline form of cocaine broken into small pieces and smoked. * he uses crack and cocaine
# verb. - break or cause to break without a complete separation of the parts. * the ice all over the lake had cracked - make or cause to make a sudden sharp or explosive sound. * a shot cracked across the ridge - find a solution to; decipher or interpret. * a hacker cracked the codes used in internet software - tell (a joke). * he cracked jokes which she didn't find very funny - decompose (hydrocarbons) by heat and pressure with or without a catalyst to produce lighter hydrocarbons, especially in oil refining. * catalytic cracking
# adjective. - very good, especially at a specified activity or in a specified role. * he is a crack shot