be unable to remember; "I'm drawing a blank"; "You are blocking the name of your first wife!"
If you blank out a particular feeling or thought, you do not allow yourself to experience that feeling or to have that thought. I learned to blank those feelings out I was trying to blank out previous situations from my mind. = block out
[ 'bla[ng]k ] (adjective.) 14th century. Middle English, from Middle French blanc colorless, white, of Germanic origin; akin to Old High German blanch white; probably akin to Latin flagrare to burn; more at BLACK.