This one was heard on the NPR radio show, the Diane Rehm show, last week. The speaker intended to say “double-edged sword” based on the context. This is a mash up of “two way street” (reciprocal situation), “cuts both ways”, and “double edged sword”, both meaning advantages and disadvantages. Of course I am also reminded of those swiss army knives, with the various blades and devices all in one unit. Thanks to Vicky Ameel-Kovacs for hearing and sharing this one!