- an error or oversight
- an unlucky happening; mishap

Katrina's son's Halloween candy was too tempting to resist and forced her to slip up on her diet.
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."
YourDictionary definition and usage example. Copyright © 2018 by LoveToKnow Corp
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slip-up

Also written slipup
Webster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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MLA Style
"Slip-up." YourDictionary. LoveToKnow. www.yourdictionary.com/slip-up.
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Slip-up. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/slip-up
slip-up

noun
An error; an oversight.
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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MLA Style
"Slip-up." YourDictionary. LoveToKnow. www.yourdictionary.com/slip-up.
APA Style
Slip-up. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/slip-up

English Wiktionary. Available under CC-BY-SA license.
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MLA Style
"Slip-up." YourDictionary. LoveToKnow. www.yourdictionary.com/slip-up.
APA Style
Slip-up. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/slip-up
Sentence Examples
- When people expect perfection from themselves, often one little slip-up sends them into a tailspin and back to the old eating habits with a "what's the use" mentality.
- Even the rich and famous make mistakes, and when celebrity oops pictures capture the moment, the world can easily witness the slip-up when the photos appear online.
- Many other celebs have experienced a malfunctioning wardrobe since Janet Jackson's slip-up in 2004, but none have received the same amount of publicity.
- Though her slip-up set Twitter on fire, viewers were mostly forgiving.
WORDS NEAR slip-up IN THE DICTIONARY
- slip-up
- slip up on
- slip-ups
- slipage