insid.ebant V 3 1 IMPF ACTIVE IND 3 P
insido, insidere, insedi, insessus V (3rd) [XXXBO]
sit/settle on; occupy/seize, hold (position); penetrate, sink in; merge into;
insid.ebant V 2 1 IMPF ACTIVE IND 3 P
insideo, insidere, insidi, insessus V (2nd) [XXXBO]
sit (at/on); sit (on) a horse; be seated; (things) rest/lie upon; lie heavy;
be situated in/on; inhabit (area); lie in ambush (in); be troublesome (to);
be fixed/stamped in; adhere to; grip; take possession of; hold/occupy;
insid.ebant V 3 1 IMPF ACTIVE IND 3 P
insido, insidere, insidi, insessus V (3rd) [XXXFO] veryrare
sit/settle on; occupy/seize, hold (position); penetrate, sink in; merge into;

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.