1 also blank out [intransitive] informal
if you blank, or if your mind blanks, you are suddenly unable to remember something:
I just blanked in the oral exam.
2 [transitive] British English informal
to ignore someone who you would usually greet or speak to:
Last time I saw Mike Adams he completely blanked me.
blank something ↔ outphrasal verb
to cover something so that it cannot be seen:
The actual names had been blanked out.
to completely forget something, especially deliberately:
I tried to blank out everything he had said.