Ha-ha definitions

hô'hô'
Used to express amusement or scorn.
interjection
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Used to suggest the sound of laughter, in expressing variously humor, joy, derision, etc.
interjection
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This sound.
noun
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A fence, wall, etc. set in a ditch around a garden or park so as not to hide the view from within.
noun
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An onomatopoeic representation of laughter.
interjection
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Type of boundary to a garden, pleasure-ground, or park, designed not to interrupt the view and to be invisible until closely approached.
noun
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An approximation of the sound of laughter.
interjection
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noun
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Something funny; a joke.
noun
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A ditch with one vertical side, acting as a sunken fence, designed to block the entry of animals into lawns and parks without breaking sightlines.
noun
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Expression of laughter.
interjection
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A sound made in imitation of laughter.
noun
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1

Origin of ha-ha

Grills of iron are very necessary ornaments in the lines of walks, to extend the view, and to show the country to advantage. At present we frequently make thoroughviews, called Ah, Ah, which are openings in the walls, without grills, to the very level of the walks, with a large and deep ditch at the foot of them, lined on both sides to sustain the earth, and prevent the getting over; which surprises the eye upon coming near it, and makes one laugh, Ha! Ha! from where it takes its name. This sort of opening is haha, on some occasions, to be preferred, for that it does not at all interrupt the prospect, as the bars of a grill do.