a person who habitually makes mistakes, spoils things, gets into trouble, etc., especially through carelessness or irresponsibility.
a mistake, blunder, malfunction, or the like.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use goof-up in a sentence
We know we're gonna get 'em eventually, because we know they're gonna goof up eventually, and then we'll have 'em.Nor Iron Bars a Cage.... | Gordon Randall Garrett
What kind of psionic force would it take to make so many people in the United States goof up the way they were doing?Occasion for Disaster | Gordon Randall Garrett
Other Idioms and Phrases with goof-up
Blunder, make a mistake, spoil. For example, I really goofed up and got all the dates wrong. This expression emerged in the military during World War II, along with the synonymous goof off. Quite often up is omitted, as in Sorry, I goofed. [Slang; c. 1940]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.