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Verb: deepen  dee-pun
  1. Make more intense, stronger, or more marked
    "This event only deepened my convictions";
    - intensify, compound, heighten
     
  2. Become more intense
    "His dislike for raw fish only deepened in Japan";
    - intensify
     
  3. Make deeper
    "They deepened the lake so that bigger pleasure boats could use it"
     
  4. Become deeper in tone
    "Her voice deepened when she whispered the password";
    - change

Derived forms: deepening, deepens, deepened

Type of: change, enlarge, increase