open the kimono v. phr. to expose or reveal secrets or proprietary information. (source: Double-Tongued Dictionary)
Further reading
The proverb when in Rome, do as the Romans do suggests one should respect local customs and traditions, but also more generally that sometimes it’s better to go along with a group’s consensus than resist and make a fuss. But why in Rome and not in...
In one episode of The Great Pottery Throwdown, a soothing British reality show that features amateur ceramicists, someone jokes about spending a night on the tiles. In this case, the phrase has nothing to do with crafting tiles from clay. A night on...