(transitive) To makeworse; to make inferior in quality or value; to impair.to deteriorate the mind
SoutheyThe art of war, like every other art, ecclesiastical architecture alone excepted, was greatly deteriorated during those years of general degradation...
(intransitive) To grow worse; to be impaired in quality; to degenerate.
2011, January 8, Paul Fletcher, Stevenage 3 - 1 Newcastle, It was turning into an abysmal afternoon for Newcastle and it deteriorated further when Tiote saw red for his challenge on Jon Ashton.
