deteriorate

/di-ˈtir-ē-ə-ˌrāt/

Late Latin deterioratus, past participle of deteriorare, from Latin deterior worse, from de- + -ter (suffix as in Latin uter which of two) + -ior (comparative suffix)

verb

  1. to make inferior in quality or value : impair

  2. disintegrate

  3. to become impaired in quality, functioning, or condition : degenerate

Exposure to sunlight may deteriorate the paint.