SULLY

[verb] [T] [formal] - to spoil (something or someone's perfect reputation, purity or cleanliness)His reputation, he said, had been unfairly sullied by allegations, half-truths and innuendos.The record company fears its association with the discredited rock star might sully its image.My mother didn't want me to associate with the rough boys down the road in case they sullied my mind.No speck of dirt had ever sullied his hands.