Tantivy definitions

tăn-tĭv'ē
At full gallop; at top speed.
adverb
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A hunting cry.
noun
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A fast, furious gallop; top speed.
noun
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At full gallop; headlong.
adverb
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A gallop; rapid movement.
noun
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(obsolete) At full tilt.

To ride tantivy.

adverb
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(informal) The sound of a hunting horn in imitation of a galloping horse.
noun
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Origin of tantivy

A fox-hunting term, said to be from the note of a hunting horn.