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Definition of crackerjack noun from the Oxford Advanced Learner's Dictionary

crackerjack

noun
 
/ˈkrækədʒæk/
 
/ˈkrækərdʒæk/
(North American English, informal)
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  1. an excellent person or thing
See crackerjack in the Oxford Advanced American Dictionary

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ripple effect
noun
 
 
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Change, cause and effect
C2
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