enjoyable social activity; a good time

he loves the craic, the late nights

it was great craic and I look forward to it this year again

a line on the surface of something along which it has split without breaking apart

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

enjoyable social activity; a good time

he loved the crack, the laughing

an attempt to achieve something

I fancy having a crack at winning a fourth title

a potent hard crystalline form of cocaine broken into small pieces and inhaled or smoked

he uses crack and cocaine

a crack dealer