English

Definition of crack adjective from the Oxford Advanced Learner's Dictionary

 

crack

 adjective
adjective
BrE BrE//kræk//
 
; NAmE NAmE//kræk//
 
 
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[only before noun] expert and highly trained; excellent at something crack troops He's a crack shot (= accurate and skilled at shooting). Word Origin Old English cracian ‘make an explosive noise’; of Germanic origin; related to Dutch kraken and German krachen. Sense (8) of the noun is from Irish craic ‘entertaining conversation’.
See the Oxford Advanced American Dictionary entry: crack