Webster's Revised Unabridged Dictionary · 1913

Toughen

Toughen , verb, intransitive and transitive

To grow or make tough, or tougher.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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