to air dirty laundry
As duas lavaram muita roupa suja na frente de todo mundo!
The two of them aired a lot of dirty laundry in front of everyone!
The exact origin is not firmly documented, but the image is transparent. In the days before home plumbing, laundry was often scrubbed at a shared washhouse, fountain or riverbank, where any stain on a household's clothes was on display for all the neighbours to see.
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