Ha-ha n. A sunk fence; a fence, wall, or ditch, not visible till one is close upon it. [Written also haw-haw.]
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haw-haw
n 1: a loud laugh that sounds like a horse neighing [syn: hee-haw,
horselaugh, ha-ha]
2: a ditch with one side being a retaining wall; used to divide
lands without defacing the landscape [syn: sunk fence, ha-ha]