blank out

phrasal verb·1 sense·particle out

Meanings

1

Suddenly fail to remember or think of something

Why “out”? Going outward until nothing remains. Supply is gone.

My mind blanked out in the exam.
My mind suddenly failed to remember anything in the exam.
His name blanked out of my mind.
My mind suddenly failed to remember his name.

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My mind blanked out in the exam. What does it mean?

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