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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. 2018.
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Examples from the Web for posthaste
Historical Examples
  • Didn't she send me posthaste with an umbrella 'cause she see a little cloud in the sky?

    Pollyanna Eleanor H. Porter
  • He accordingly sent his private secretary Biraga, posthaste to Spain with two letters.

  • The bearer on horseback, the horse in a foam—smoking like a boiler at the heat—be sure a posthaste letter!

    The Hunchback James Sheridan Knowles
  • posthaste, two months since, came to the house outside Granada, the buyer for the London firm.

    The Wolf Cub Patrick Casey
  • It was as Rolfe had said, and the free and able-bodied of the plantations had put out, posthaste, for matrimony.

    To Have and To Hold Mary Johnston
  • These words from his physician, and the spectacle of my friend, now reduced almost to a skeleton, sent me posthaste to Serampore.

    Autobiography of a YOGI Paramhansa Yogananda
  • He was prepared, at any alarming silence, to send the boys down there posthaste to investigate.


    B. M. Bower
British Dictionary definitions for posthaste


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 posthaste

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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posthaste in Culture
posthaste [(pohst-hayst)]

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

The 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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