knocking mill

English

Noun

knocking mill (plural knocking mills)

  1. A type of mill powered by running water that repeatedly applies a heavy hammer to grain, ore, etc.
    • 1828, Thomas Keightley, The Fairy Mythology, volume II, London: William Harrison Ainsworth, page 167:
      Up he started - the wind arose - the corn was chopped - the outlyers were foddered - the hand-mill moved around, as by instinct - and the knocking-mill did its work with amazing rapidity.
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