Flat, v. i. 1. To become flat, or flattened; to sink or fall to an even surface. Sir W. Temple.
2. (Mus.) To fall form the pitch.
To flat out, to fail from a promising beginning; to make a bad ending; to disappoint expectations.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.