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Related to sunk fence: Sunken fence
A walled ditch or sunken obstacle, such as a hedge, serving especially as a barrier to livestock without impairing the view or scenic appeal. Also called ha-ha2.
(Agriculture) a ditch, one side of which is made into a retaining wall so as to enclose an area of land while remaining hidden in the total landscape. Also called: ha-ha
a wall or other barrier set in a ditch to divide lands without marring the landscape.Also called ha-ha.