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present tense third-person singular of toughen
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1
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
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
to make more harsh, uncompromising, or severe
- attempts to toughen conditions under which waivers from military service would be permitted
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