One & All

I recently heard about a new kind of puzzle:

Inside each set of the following words, there are a pair of smaller words. By putting & between them, lo & behold, you'll make a familiar phrase. For example, "Thighbone/Swallowtail" conceals "High & Low."

One problem is that there might be a common phrase other than “High & Low” hidden by “Thighbone/Swallowtail.”