One's personal, intimate, or private matters or secrets, especially that which may be embarrassing if made public. From the expression "don't wash/air your dirty linen in public." Those who consider running for public office must be aware that their dirty linen is likely to be exposed to the public.David is such a gossip, always talking about other people's dirty linen.
n. scandal; unpleasant private matters. I wish you wouldn’t put our dirty linen out for everyone to see. She seems always to drag out her dirty linen whenever possible.