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  1. STRENGTHENS Synonyms: 136 Similar and Opposite Words - Merriam-Webster

  2. STRENGTHEN | English meaning - Cambridge Dictionary

  3. Strengthen Definition & Meaning - Merriam-Webster

  4. STRENGTHEN Synonyms: 136 Similar and Opposite Words - Merriam-Webster

  5. STRENGTHEN Definition & Meaning | Dictionary.com

  6. Strengthen - Definition, Meaning & Synonyms | Vocabulary.com

  7. strengthen verb - Definition, pictures, pronunciation and usage …

  8. strengthen verb - Definition, pictures, pronunciation and usage …

  9. strengthen | meaning of strengthen in Longman Dictionary of ...

  10. STRENGTHEN definition and meaning | Collins English Dictionary

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