Sid, Sed, Sess Words.

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Across
  1. 3. An activity that involves much sitting and little exercise.
  2. 4. Be in the position of authority in a meeting or other gathering.
  3. 6. Preoccupy or fill the mind of (someone) continually, intrusively, and to a troubling extent.
  4. 7. A meeting or period of time spent on an activity.
Down
  1. 1. To evaluate or test the quality of something.
  2. 2. Matter that settles to the bottom of a liquid.
  3. 5. To live or stay in a specific place.
  4. 8. (of water) go down to a lower or the normal level.