as tough as nails
idiom
of a person
: very tough : not sentimental or easily influenced
When she's negotiating a contract, she can be as tough as nails.
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“As tough as nails.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/as%20tough%20as%20nails. Accessed 10 Sep. 2025.
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