kiss and tell

kiss and tell (third-person singular simple present kisses and tells, present participle kissing and telling, simple past and past participle kissed and told)

1. To betray a confidence by disclosing private information, especially of a sexual nature.
   • 2007, Robert Ayres Carter, Nobody yet Knows Who I Am: A Personal History: 1943-1953, Xlibris Corporation, →ISBN, page 34:

     While I told Joe all about my Beth, and he told me about his Ellen, a student at Northwestern, I did not go into any details about my sex life; I have never liked to kiss and tell, even though I suppose that's what I'm doing in these pages.

• kiss-and-tell

• tell tales out of school

• “kiss_and_tell”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• Gary Martin (1997–) “Kiss and tell”, in The Phrase Finder.