dissertate

verb2

1. •
   To make a dissertation; to discourse.

   • In fact, if a miracle ever sat up and slapped him in the face over his small beer and muffin he'd […] dissertate in Latin on the experiential impossibility of its existence. — 1982
2. •
   To write one's dissertation.

   • Mark stayed up until 2 a.m. dissertating last night.