the sound of music

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Across
  1. 2. small and thin
  2. 7. frightening
  3. 8. weakened
  4. 10. push roughly
  5. 11. to hide
Down
  1. 1. in phases
  2. 3. a person who is in his teens
  3. 4. very sharp
  4. 5. prohibited
  5. 6. requested
  6. 9. to follow