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Meaning of duck on a rock

duck' on a rock'

Pronunciation: [key]
  1. a children's game in which one player stands guard over a stone on a rock while the other players attempt to knock it off by throwing another stone in turn: if the thrower is tagged by the guard while trying to recover the stone, the two players then change positions. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.