Flush, v. i.(Mining) (a) To operate a placer mine, where the continuous supply of water is insufficient, by holding back the water, and releasing it periodically in a flood. (b) To fill underground spaces, especially in coal mines, with material carried by water, which, after drainage, constitutes a compact mass.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.