Absorbed prefixes

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Across
  1. 2. go together with someone
  2. 5. meeting together
  3. 6. when you cannot wait
  4. 9. make changes that help someone
  5. 11. not very useful
  6. 14. put light on
  7. 16. when the police catch a criminal
  8. 17. the action to move to another country
  9. 18. not what you normally see
  10. 20. silence, ignore, pretend it's not true
  11. 21. work together
Down
  1. 1. run out of air
  2. 3. exchange letters or emails
  3. 4. at the end of a word
  4. 7. act in a childish way for your age
  5. 8. the moment you get there
  6. 10. pick up or get
  7. 12. it makes no sense
  8. 13. tell, say, name
  9. 15. move to another country
  10. 18. you can't do that
  11. 19. give help