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blank on (something)
To suddenly forget or be unable to recall something. I can't believe I totally blanked on her name earlier when I've known her for years!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To forget or fail to remember something; draw a blank on something: I blanked on her name even though we had just been introduced.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.