definition of
cracking

[1] #1 cracking n. [crack, snap] a sudden sharp noise; "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig". wn

[2] #2 cracking n. [fracture, crack] the act of cracking something. wn

[3] #3 cracking s. [bang-up, bully, corking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing] very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing". wn

[4] #4 cracking n. the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process). wn