subs. phr. (American).—A chop from the middle of the sirloin—with upper and undercut: occasionally, but improperly, from the wing-rib.
1870. S. L. CLEMENS (‘Mark Twain’), The Innocents Abroad, xiii. One would not be at all surprised to hear him say: ‘A mutton-roast to-day, or will you have a nice PORTER-HOUSE STEAK?’
