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goof someone or something up
Inf. to mess someone or something up; to ruin someone's plans; to make something nonfunctional. Who goofed this machine up? Who goofed up the machine?
goof up (on something)
Inf. to make an error with something; to blunder while doing something. Please don't goof up on this job. If you goof up one more time, you're finished.
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]
1. To make a mistake, especially out of confusion or ignorance: You really goofed up by not telling your parents you were leaving. I didn't follow the instructions for the job carefully, so I goofed up.
2. To cause someone or something to blunder: The directions to the park were confusing and they goofed me up. You're not alone in getting lost; that fork in the road goofs up everybody.
3. To perform something badly; blunder in executing something: You really goofed up the spelling section of the test. The band didn't rehearse enough before the concert and really goofed the march up.