blank out

Short definition from Wiktionary

Verb

1. 1
   To become blank.
2. 2
   To become blank: To temporarily lose memory.
3. 3
   To cause (something) to become blank: To erase (something), leaving a blank in its place.
4. 4
   To cause (something) to become blank: To erase from one's memory.
5. 5
   To get even; to neutralise.