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  1. Toughen Definition & Meaning - Merriam-Webster

  2. TOUGHEN | English meaning - Cambridge Dictionary

  3. TOUGHEN | definition in the Cambridge English Dictionary

  4. TOUGHEN Synonyms: 66 Similar and Opposite Words - Merriam-Webster

  5. TOUGHEN Definition & Meaning | Dictionary.com

  6. toughen verb - Definition, pictures, pronunciation and usage …

  7. Toughen - Definition, Meaning & Synonyms | Vocabulary.com

  8. TOUGHEN definition in American English | Collins English Dictionary

  9. TOUGHEN Definition & Usage Examples | Dictionary.com

  10. toughen | definition in the Cambridge Learner’s Dictionary