Air dirty laundry
Meaning
Discuss private problems in public.
Usage
Used to caution against revealing sensitive disputes.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Washing clothes and letting them dry exposed to view.
Used in Victorian advice about discretion.