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[pohst-heyst] /ˈpoʊstˈheɪst/
with the greatest possible speed or promptness:
to come to a friend's aid posthaste.
Archaic. great haste.
Origin of posthaste
First recorded in 1530-40; post3 + haste Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for post-haste
Historical Examples
  • As it may therefore be of importance, I dispatch it with my own, by my servant, post-haste.

    Clarissa, Volume 3 (of 9) Samuel Richardson
  • Of course we knew at once what it meant, and he set off post-haste.

  • He knew that this would start us post-haste for our apartment, which it did.

    The Van Dwellers

    Albert Bigelow Paine
  • One deadly sickness he had at Kenilworth, when my father was ridden for post-haste.

    The Caged Lion Charlotte M. Yonge
  • A horseman was sent forward, post-haste, to intimate to us that they were on their way.

  • But I had not been absent more than an hour, before I was sent for in post-haste.

  • Then came the autumn, post-haste before the down rush of winter.

    The Faith of Men Jack London
  • No sooner was he thus placed, than Stimson was despatched, post-haste, for assistance.

    The Sea Lions James Fenimore Cooper
  • Surely you came off in post-haste this morning without your rings?'

    The Guinea Stamp

    Annie S. Swan
  • The accusations were sufficient to make Nevers resign all his offices in his kinsman's court and retire, post-haste, to France.

    Charles the Bold Ruth Putnam
British Dictionary definitions for post-haste


with great haste; as fast as possible
(archaic) great haste
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for post-haste



1590s, from a noun (1530s) meaning "great speed," usually said to be from "post haste" instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The verb post "to ride or travel with great speed" is recorded from 1550s.

Online Etymology Dictionary, © 2010 Douglas Harper
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post-haste in Culture
posthaste [(pohst-hayst)]

Immediately, with great speed: “Get the flood warning to the media posthaste.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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