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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]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.