from the GNU version of the Collaborative International Dictionary of English
- n. A piece of wood or sheet metal fitted into a ditch to dam up the water so as to overflow a field.
from The Century Dictionary and Cyclopedia
- n. A small movable dam of metal, wood, or cloth used temporarily to obstruct the flow of water in irrigation laterals or distributing-ditches, forcing the water to adjacent fields.
Sorry, no etymologies found.