(third-person singular simple present nacks, present participle nacking, simple past and past participle nacked)
"nack." YourDictionary, n.d. Web. 12 November 2018. <https://www.yourdictionary.com/NACK>.
nack. (n.d.). Retrieved November 12th, 2018, from https://www.yourdictionary.com/NACK
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