grad, gress = step

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Across
  1. 4. a slow change; a step-by-step change
  2. 6. hostile; pushy; stepping into someone's space with forceful energy
  3. 7. to reduce someone's worth or value; to make someone step down to a lower position or rank; to move down a step in social status
  4. 8. to stray away from the main topic; to step away from the topic and lose clarity; to wander in thoughts or ideas
  5. 9. Celsius; temperature rating on the thermometer made up of 100 degree intervals or steps between the freezing and boiling points of water
  6. 10. a step-by-step sequence within a continuous series
Down
  1. 1. to move up a step in education (usually out of a school)
  2. 2. to move up a step or level; to improve in quality
  3. 3. to move a step in a positive direction; to improve
  4. 5. to go back; to move backward; to move a step back