What is the meaning of good luck?

noun

10
 
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APAWordNet. (2010). good luck. Retrieved August 21, 2017, from http://smartdefine.org/good_luck/definitions/1235585
ChicagoWordNet. 2010. "good luck" http://smartdefine.org/good_luck/definitions/1235585 (accessed August 21, 2017).
HarvardWordNet 2010, good luck, Smart Define, viewed 21 August, 2017, <http://smartdefine.org/good_luck/definitions/1235585>.
MLAWordNet. "good luck" 23 October 2010. Web. 21 August 2017. <http://smartdefine.org/good_luck/definitions/1235585>