(comparative more tough as nails, superlative most tough as nails)
"tough-as-nails." YourDictionary, n.d. Web. 15 April 2019. <https://www.yourdictionary.com/tough-as-nails>.
tough-as-nails. (n.d.). Retrieved April 15th, 2019, from https://www.yourdictionary.com/tough-as-nails
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