Short /u/ graphemes

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Across
  1. 3. to fall straight down
  2. 6. can be used as a spread on bread
  3. 7. to dissapear under water
  4. 9. when penguins group together to warm themselves
  5. 11. to make something appear out of nothing
  6. 13. to be in complete shock
  7. 14. when someone is mischevious and smart
  8. 15. to achieve a goal
Down
  1. 1. an 8-legged sea creature
  2. 2. to stop or lesson the actions of something
  3. 4. someone who refuses to change their mind
  4. 5. something very bumpy or rough
  5. 8. someone who eats or hoards a lot of food or items
  6. 10. taken on flights to store belongings
  7. 12. a person who set up meat for customers to buy