open one's kimono

== English == === Alternative forms === open up the kimono === Etymology === Unknown. Possibly a calque of Japanese 胸襟を開く (“to share one's feelings”, literally “to open one's collar”) or Japanese 裃を脱ぐ (“to be frank”, literally “to take off one's haori and hakama (two garments worn over a kimono)”). === Pronunciation === === Verb === open the kimono (third-person singular simple present opens the kimono, present participle opening the kimono, simple past and past participle opened the kimono) (idiomatic, often business) To reveal confidential information, especially details of one's business operations.