1. [ adjective ] making a loud sharp sound as of a rifle shot or a breaking branch or a whip

"lion tamers with their cracking whips"

Related terms: noisy
2. [ noun ] the act of cracking something
Synonyms: crack fracture
Related terms: breakage crack fracture
3. [ noun ] a sudden sharp noise
Synonyms: crack snap

"the crack of a whip" "he heard the cracking of the ice" "he can hear the snap of a twig"

Related terms: noise crack snap
4. [ adjective ] (informal) very good
Synonyms: great swell bully keen dandy corking peachy neat nifty not_bad groovy slap-up cool smashing bang-up

"a bully pulpit" "a neat sports car" "had a great time at the party" "you look simply smashing"

Related terms: colloquialism good
5. [ noun ] (chemistry) the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)
Related terms: chemical_process hydrocracking crack
Similar spelling:   croaking