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To behave in an impolite or unrestrained manner. Sure, sometimes I forget myself and snap at the kids, but doesn't every mother?
See also: forget
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To lose one's reserve, temper, or self-restraint.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.