(third-person singular simple present blocks up, present participle blocking up, simple past and past participle blocked up)
"block-up." YourDictionary, n.d. Web. 18 October 2018. <http://www.yourdictionary.com/block-up>.
block-up. (n.d.). Retrieved October 18th, 2018, from http://www.yourdictionary.com/block-up
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