Friend J sent this story from LifeHacker about corporate idioms, including:

--take this offline
--touch base
--open the kimono

Some didn't count as idioms, to my eye, because they don't employ any metaphors, though they comprise another interesting category of bureaucracyspeak: the euphemism. As in:

going forward..." as meaning: "I'm not going to tell you that you just did this wrong, but never do it that way again."

All in all, an interesting discussion. However, I'm glad to report that hat they accepted my comment about our pretend corporate idiom, "suck the hemp out of the rope":

Around here people say "suck the hemp out of the rope," which means the effort has been ruined, often at great effort.

It's out there. Now we wait to see how it spreads.