(comparative more knockproof, superlative most knockproof)
knock + -proof
"knockproof." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/knockproof>.
knockproof. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/knockproof
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