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WordReference Random House Learner's Dictionary of American English © 2024crack•er•jack /ˈkrækɚˌdʒæk/USA pronunciation n. [countable]- a person or thing that shows outstanding ability or excellence.
adj. - exceptionally fine:a crackerjack worker.
Collins Concise English Dictionary © HarperCollins Publishers:: crackerjack /ˈkrækəˌdʒæk/ informal adj - excellent
n - a person or thing of exceptional quality or ability
Etymology: 20th Century: changed from crack (first-class) + jack1 (man) Crack′er Jack′, [Trademark.]- Food, Trademarksa confection of caramel-coated popcorn and peanuts.
crack•er•jack (krak′ər jak′),USA pronunciation [Informal.]n. - a person or thing that shows marked ability or excellence.
adj. - of marked ability;
exceptionally fine.
Also, crackajack. - 1890–95, American; earlier crackajack, rhyming compound based on crack (adjective, adjectival); -a- as in blackamoor; jack1 in sense "chap, fellow''
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