What is the meaning of belt up?

verb

12
 
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APAWordNet. (2010). belt up. Retrieved February 21, 2019, from http://smartdefine.org/belt_up/definitions/1259969
ChicagoWordNet. 2010. "belt up" http://smartdefine.org/belt_up/definitions/1259969 (accessed February 21, 2019).
HarvardWordNet 2010, belt up, Smart Define, viewed 21 February, 2019, <http://smartdefine.org/belt_up/definitions/1259969>.
MLAWordNet. "belt up" 23 October 2010. Web. 21 February 2019. <http://smartdefine.org/belt_up/definitions/1259969>