01 n. An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis.
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1.
An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis.[Slang]
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2.
A preparation of popped corn, candied and pressed into small cakes. The name Cracker Jack(TM) is now a trademark for a similar confection.[U. S.]
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3.
something excellent of its kind.