DETERIORATE Copy link • DETERIORATEINTR., deteriorem fieri: in pejorem partem verti et mutari: in pejus mutari. To have deteriorated, deteriore statu or conditione esse; pejore loco esse. TRANS., deterius facere or in detenus mutare aliquid (opposed to corrigere): in pejus mutare or vertere et mutare (opposed to in melius mutare): corrumpere: depravare (either physically or morally; opposed to corrigere): cf., Deteriorare, very late; Claud. Mamert., Frontin., Symm.