ex ‧ punge /ɪkˈspʌndʒ/ BrE AmE verb [transitive] formal
[ Date: 1600-1700 ; Language: Latin ; Origin: expungere 'to mark something with small holes to show that it is to be removed' , from pungere 'to make a small hole' ]
1 . to remove a name from a list, piece of information, or book
2 . to make someone forget something unpleasant
expunge something from something
I wanted to expunge the memory of that first race from my mind.