Silent letters

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Across
  1. 4. The past tense of “know.”
  2. 5. Money borrowed from the bank to buy a house.
  3. 9. A unit of time equal to sixty minutes.
  4. 11. The spirit of a dead person.
  5. 13. To formally leave a job or position.
  6. 14. The part of your mouth you use to taste.
Down
  1. 1. Quiet and relaxed.
  2. 2. Belonging to or coming from a different country.
  3. 3. The joint in the middle of your leg.
  4. 4. To make clothes using wool and needles.
  5. 6. To estimate an answer without full knowledge.
  6. 7. A large grave or burial place made of stone.
  7. 8. To put words on paper or a screen.
  8. 10. Sport where opponents fight by grappling with each other.
  9. 12. A medieval soldier on horseback, often in armour.