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obsolete To press something with feet or hooves, so as to separate some desirable part from it. One traditional way of threshing grain or cereal was to spread them on the floor in a circle and have oxen or bullocks tread them out. The peasants tread out the grapes, while the wealthy enjoy the wine that is produced as a result.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.