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9 Grammatical Pitfalls

over and done with

Completed, finished, as in That argument's over and done with, so drop the subject. This usage is somewhat redundant but more emphatic than over with [ First half of the 1900s ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Quotes with over and done with