open (up) (one's) kimono
To be transparently open about one's plans, dealings, or intentions. I assure you that our company has opened our kimono about every aspect of our tax obligations to the state.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.