Dredge up means to bring up something unpleasant, painful or unwanted from the past. The antonyms for the word dredge up are forget, bury, suppress, or repress. To forget means to no longer remember something, to bury is to put something deep in the ground, to suppress or repress is to prevent something from being expressed or coming to the surface. By forgetting, burying, suppressing or repressing anything unpleasant from the past, we can avoid reliving the negative memory which can have a significant impact on our mental health. Therefore, it is essential to practice healthy coping mechanisms to deal with any past unresolved issues.