Phraseological Units

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Across
  1. 4. Informal language
  2. 6. weak point
  3. 7. a group of thirteen
  4. 9. fixed expression
  5. 10. Something hidden
Down
  1. 1. A bad family member
  2. 2. Old traditional story
  3. 3. final defeat
  4. 5. System of communication
  5. 8. Religious book