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crack up
crack-up
crackbrained
crackdown
cracked
cracked wheat
cracker
cracker-barrel
crackerjack
crackers
crackhead
cracking
crackle
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crackly
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crackerjack
crack·er·jack [ krákər jàk ]


adjective 
Definition:
 
excellent: outstanding in quality or ability ( dated informal )

[Late 19th century. <cracker "excellent" + jack1 "man"]

crack·er·jack noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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