verb

obliterate or remove completely (something unwanted or unpleasant).

the kind of man that could expunge an unsatisfactory incident from his memory

erase,remove,delete,rub out,wipe out,efface,cross out,strike out,blot out,blank out,cancel,annul,destroy,obliterate,eradicate,extinguish,eliminate,abolish,annihilate,extirpate