(comparative more knockproof, superlative most knockproof)
knock + -proof
"knockproof." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/knockproof>.
knockproof. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/knockproof
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