1 The name generally used to describe strong and confused currents produced by the narrowness of channels, an uneven bottom producing overfalls, or the crossing of two tides.
2 As a verb, it describes the action of a ship's propeller when the ship pitches to the extent that the propeller is occasionally lifted out of the water. The lack of water resistance will cause the engine, and thus the propeller, to race, with a consequent strain on the engine.
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