- The definition of a slip up is a mistake or error.
An example of a slip up is when you mix up numbers in a report you are writing and write "12" when the number should be "21."
slip-up definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- an error or oversight
- an unlucky happening; mishap
Also written slipup
slip-up definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An error; an oversight.
slip-up - Phrases/Idioms
Make a mistake, blunder, as in I slipped up and gave the invitations to the wrong people. [Mid-1800s]