Convert nouns or adjectives into verbs using the suffix -ify

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Across
  1. 3. To mean or indicate
  2. 4. Make stronger or more extreme
  3. 5. Increase the volume or intensity
  4. 8. Make firm or harden
  5. 10. Alter dishonestly; fake
Down
  1. 1. Give evidence under oath
  2. 2. Arrange into categories
  3. 6. Remove impurities from
  4. 7. Formally inform
  5. 9. Praise highly or honour