dis·col·or (US) or Brit dis·col·our 
/dɪsˈkʌlɚ/ verb
dis·col·ors; dis·col·ored; dis·col·or·ing /dɪsˈkʌlɚ/ verb : to change in color especially in a bad way [no obj] ▪ The fabric is guaranteed not to discolor. [+ obj] ▪ The wine stain discolored the rug.
— discolored adjective [more discolored; most discolored]
▪ badly discolored teeth
▪ badly discolored teeth
