1
as in strengthens
to increase the ability of (as a muscle) to exert physical force
weight lifting will help toughen those flabby muscles of yours
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2
as in hardens
to make able to withstand physical hardship, strain, or exposure
hiking every morning through snow and ice toughened him considerably
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3
as in stiffens
to make more harsh, uncompromising, or severe
attempts to toughen conditions under which waivers from military service would be permitted
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“Toughens.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/toughens. Accessed 1 Dec. 2024.
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