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general::
Phrase(s): open (up) one’s kimono
Sl. to reveal what one is planning. (From the computer industry, referring especially to the involvement of the Japanese in this field.) • Sam isn’t one to open his kimono much when it comes to new products. • Even if Tom appears to open up his kimono on this deal, don’t put much stock in what he says.
McGrawhill's American Idioms And Phrasal Verbs