Convert nouns or adjectives into verbs using the suffix -en

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Across
  1. 3. To make something lighter or more vivid.
  2. 6. To make something level or flat.
  3. 8. To make something thicker or more dense.
  4. 9. To make something stronger or more durable.
  5. 10. To make something shorter in length.
Down
  1. 1. To make something straight or align it.
  2. 2. To make something longer.
  3. 4. To make something dark or covered in black.
  4. 5. Incorrect or wrong.
  5. 7. To make something more secure or firm.