Also, stone or stony broke. Completely penniless. For example, I can't help you—I'm flat broke, or He's stone broke again. The first term dates from the mid-1800s and uses flat in the sense of “completely” or “downright.” The variant dates from the late 1800s.
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Words nearby flat broke
Example sentences from the Web for flat broke
At last he says to me, 'You are flat-broke, and they'll all be down on you when you get back to the post.The Deserter|Charles King