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To reveal confidential information, especially details of one's business operations.
Definition source: English Wiktionary via Wiktextract
Usage: idiomatic, often
Topics: business
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
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)”).