What is the meaning of be sick?

verb

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APAWordNet. (2010). be sick. Retrieved April 24, 2019, from http://smartdefine.org/be_sick/definitions/1259623
ChicagoWordNet. 2010. "be sick" http://smartdefine.org/be_sick/definitions/1259623 (accessed April 24, 2019).
HarvardWordNet 2010, be sick, Smart Define, viewed 24 April, 2019, <http://smartdefine.org/be_sick/definitions/1259623>.
MLAWordNet. "be sick" 23 October 2010. Web. 24 April 2019. <http://smartdefine.org/be_sick/definitions/1259623>