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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
  • And when Tom arrived, post-haste upon receipt of Nancy's note, he was met at the front door with the news of her relapse.

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

  • The news brought Professor Thorpe post-haste to Storm, pale, but ready as ever with his services.

    Kildares of Storm Eleanor Mercein Kelly
  • Then came the autumn, post-haste before the down rush of winter.

    The Faith of Men Jack London
  • The Count therefore presents him with a commission in his own regiment, and bids him pack off to Seville post-haste.

    The Opera R.A. Streatfeild
  • Surely you came off in post-haste this morning without your rings?'

    The Guinea Stamp Annie S. Swan
  • This belief was confirmed by the sight of two machine-guns which were being galloped off post-haste to a destination unknown.

  • The latter sent a soldier to General Grant, who himself rode up, post-haste, at the summons.

    The Lincoln Story Book Henry L. Williams
  • 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
  • “And look sharp,” he added in a tone of voice which sent the butler off in post-haste.

    Lady Maude's Mania George Manville Fenn
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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