[krak], (Noun)

Definitions:
- a line on the surface of something along which it has split without breaking apart
(e.g: a hairline crack down the middle of the glass)

- a sudden sharp or explosive noise
(e.g: a loud crack of thunder)

- a joke, typically a critical or unkind one
(e.g: he knew about the gossip and would make the odd crack)

- enjoyable social activity; a good time
(e.g: he loved the crack, the laughing)

- an attempt to achieve something
(e.g: 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
(e.g: he uses crack and cocaine)


Phrases:
- be cracked up to be
- crack a book
- crack a crib
- crack hardy
- crack of dawn
- crack of doom
- crack open a bottle
- crack wise
- fall through the cracks
- get cracking

Origin:
Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen. crack is from Irish craic ‘entertaining conversation’

[krak], (Verb)

Definitions:
- break or cause to break without a complete separation of the parts
(e.g: the ice all over the bog had cracked)

- make or cause to make a sudden sharp or explosive sound
(e.g: a shot cracked across the ridge)

- find a solution to; decipher or interpret
(e.g: the code will help you crack the messages)

- tell (a joke)
(e.g: 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
(e.g: catalytic cracking increases gasoline yields)


Phrases:
- be cracked up to be
- crack a book
- crack a crib
- crack hardy
- crack of dawn
- crack of doom
- crack open a bottle
- crack wise
- fall through the cracks
- get cracking

Origin:
Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen. crack is from Irish craic ‘entertaining conversation’

[krak], (Adjective)

Definitions:
- very good or skilful
(e.g: he is a crack shot)


Phrases:
- be cracked up to be
- crack a book
- crack a crib
- crack hardy
- crack of dawn
- crack of doom
- crack open a bottle
- crack wise
- fall through the cracks
- get cracking

Origin:
Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen. crack is from Irish craic ‘entertaining conversation’