dirty (linen|laundry)
1
one's personal matters that if shared with others could make one embarrassed or ashamed
The idiom "dirty linen" is believed to have originated in the 19th century and has its roots in the idea of laundry. In the past, it was common for people to wash their clothes by hand and hang them outside to dry. This phrase is now used figuratively to describe the act of discussing private or embarrassing matters in public, especially those relating to personal relationships or family issues.
- If you don't want to air your dirty laundry in front of your friends and family, you should keep your personal problems to yourself.
- She's always airing her dirty laundry in public, talking about her personal problems with anyone who will listen.
- The company's financial troubles have been aired in the media, and now everyone knows their dirty linen.