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Definition of sully verb from the Oxford Advanced American Dictionary

sully

verb
/ˈsʌli/ sully pronunciation American
sullies, sullying, sullied, sullied
 
(formal or literary)1 sully something to spoil or reduce the value of somethingBy cheating they have sullied the good name of their country.2 sully something to make something dirtyShe wondered if she dared risk sullying the gleaming sink.