What is the meaning of good luck?

noun

10
 
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APAWordNet. (2010). good luck. Retrieved June 23, 2017, from http://smartdefine.org/good_luck/definitions/1235585
ChicagoWordNet. 2010. "good luck" http://smartdefine.org/good_luck/definitions/1235585 (accessed June 23, 2017).
HarvardWordNet 2010, good luck, Smart Define, viewed 23 June, 2017, <http://smartdefine.org/good_luck/definitions/1235585>.
MLAWordNet. "good luck" 23 October 2010. Web. 23 June 2017. <http://smartdefine.org/good_luck/definitions/1235585>