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Definition of Tough cookie
1. Noun. (idiomatic) A person who can endure physical or mental hardship; a hardened, strong-willed person. ¹
2. Noun. (idiomatic) A hardy, resilient animal or plant. ¹
3. Noun. (idiomatic) Something troublesome or difficult to handle. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Tough Cookie
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