unsheet

From un- +‎ sheet.

unsheet (third-person singular simple present unsheets, present participle unsheeting, simple past and past participle unsheeted)

1. (transitive) To remove a sheet or sheets from; to uncover.
   • 1989, Peter Kreeft, Heaven, the Heart's Deepest Longing:

     To unsheet the ghost, to identify the culprit, let's gather more clues.

   • 2015, Elizabeth Bowen, The Death Of The Heart, page 167:

     I had to unsheet the drawing-room for him to find this, the room having been covered ready for the sweep.