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 Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.