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screw-up

To screw up is to make a mistake or error. (verb)

An example of screw up is when you add 2+2 and accidentally come up with 5.

A screw up is a mistake or something that has been done in error. (noun)

An example of a screw-up is a streaky, messy, blotchy paint job that has to be totally redone.

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See screw-up in Webster's New World College Dictionary

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