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1. The act of writing down all of one's current thoughts or necessary tasks, as to help one become more organized. Whenever I'm feeling overwhelmed, a brain dump really helps me to sort out my thoughts and see all of the things I need to do.
2. The act of communicating a large amount of information all at once or in a short span. Sorry for the brain dump—I just have a lot on my mind.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.