come out in the wash, it will
A problem will be solved or difficulties will disappear. For example, Don't worry about the fight you got into—it'll all come out in the wash. Cervantes had this metaphoric use of laundry for cleaning up a mess or difficulty in Don Quixote (Todo saldrá en la colada) and it has been repeated ever since. [Early 1600s]
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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.