tantivy

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

Adverb

 * 1)  At full tilt
 * 2) * 1737, John Ozell, ed., The Works of Francis Rabelais, M.D., fourth book, J. Brindley and C. Corbett, page 213:
 * Fryar John began to paw, neigh and whinny at the Snout's end, as one ready to leap, or at least to play the Ass, and get up and ride tantivy to the Devil like a Beggar on Horseback.

Noun

 * 1)  A rapid gallop
 * 2) * a. 1658,, letter to a Parliament Officer at Grantham
 * Sir, I expected to hear from you in the Language of the lost Groat , and the Prodigal Son , and not in such a Tantivy of Language
 * 1)  The sound of a hunting horn in imitation of a galloping horse

Usage notes

 * The sound of a hunting horn seems to be an erroneous use (according to the OED)

Verb

 * 1)  To hurry off.