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A "ha-ha" or "ha ha" is a landscaping term for a sunken fence, or fosse, -- a ditch either with a regular fence in the middle, or one with a sloping side that gets you into the ditch, and a vertical wall or fence on the other side that cannot easily be passed. The idea of using one was to keep animals and people out without spoiling the view of a formal garden or landscaped park with a raised fence. This was quite popular in the 18th century; the term is supposed to be French in origin but was found in Great Britain and the United States as well.

The term has several possible derivations. Webster 1913 under "haw-haw" says it's a duplication of "haw", meaning a hedge. Horace Walpole says in a 1780 essay that "the common people called them Ha! Ha's! to express their surprise at finding a sudden and unperceived check to their walk." The author of the A.Word.A.Day mailing list hypothesizes that the phrase might also derive from the garden owner's amusement when other people unexpectedly come upon the barrier.


Also "haw haw".

A landscaping term for a fence set in a ditch around a garden, so as to provide a barrier, but not obscure the view. Typically used only by United Kingdomites.

from The Oxford English Dictionary.

In Edward Gorey's The Awdrey-Gore Legacy a ha ha is listed first amoungst the places in the English Garden in which one might find the victim of a murder mystery.

* reprinted in Amphigorey Also.

Ha-ha" (?), n. [See Haw-haw.]

A sunk fence; a fence, wall, or ditch, not visible till one is close upon it.

[Written also haw-haw.]


© Webster 1913.

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