Words with Over- and Under- Prefixes

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Across
  1. 6. below the required age limit
  2. 7. to charge an amount that is too little
  3. 9. rated lower than the actual value
  4. 11. beyond the due date
  5. 12. valued too little
Down
  1. 1. paid too much
  2. 2. to form an estimate that is too high
  3. 3. too many people
  4. 4. under the ground
  5. 5. work too much
  6. 8. below the surface of the water
  7. 9. to draw a line underneath something
  8. 10. to load with too much of a burden
  9. 11. to sleep longer than expected or planned