Damage, as a reputation (5)
(Other definitions for taint that I've seen before include "Corrupt" , "Adulterate" , "Blemish" , "soil" , "Defile" .)
(Other definitions for tarnish that I've seen before include "Stain or blemish, silver or reputation" , "Become dull or blemished" , "Stain or blemish as with silverware" , "Become dull and discoloured" , "Discolour - sully" .)