Lewis Short
(verb) : pējōro, ārepejor, and n. (postclass.).
* Act., to render worse: statum suum pejorare, opp. to meliorem facere,Paul. Sent. 2, tit. 18.
* Neutr., to grow worse: pejorans morbus,Cael. Aur. Acut. 2, 1; id. Tard. 2, 1 fin.
Charlton T. Lewis, Charles Short, A Latin Dictionary