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Across
  1. 4. to make something active or operative
  2. 5. to begin or start
  3. 6. to attract and hold the interest and attention of someone
  4. 10. to form a theory or conjecture about a subject without firm evidence
  5. 13. to make something more difficult to understand or deal with
  6. 14. to take part in an activity
  7. 17. to recognize the value of something
  8. 18. to move around within a system or area
Down
  1. 1. to create or devise a plan, system, or theory
  2. 2. to make a situation or problem worse
  3. 3. to reach a climax or point of highest development
  4. 7. to fertilize a plant, typically by transferring pollen to the stigma
  5. 8. to make something look more attractive by putting things on it
  6. 9. to cause (someone) to feel annoyed or impatient because they cannot achieve what they want
  7. 11. to inoculate (someone) with a vaccine
  8. 12. to spend the winter in a state of inactivity and dormancy
  9. 15. to make something legally null and void
  10. 16. to deny or contradict