Dictionary definition · crack
noun
- a long narrow cleft
- a narrow opening"he opened the window a crack"
- a long narrow depression in a surface
- a sudden sharp noise"the crack of a whip"
- a chance to do something"he wanted a shot at the champion"
- witty remark
verb
- become fractured; break or crack on the surface only"The glass cracked when it was heated"
- make a very sharp explosive sound"His gun cracked"
- make a sharp sound"his fingers snapped"
- hit forcefully; deal a hard blow, making a cracking noise"The teacher cracked him across the face with a ruler"
- pass through (a barrier)"Registrations cracked through the 30,000 mark in the county"
adjective
- of the highest quality"an ace reporter"
Source: Open English WordNet (CC BY 4.0).