- with the greatest possible speed or promptness: to come to a friend's aid posthaste.
- Archaic. great haste.
Origin of posthaste
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for post-haste
As it may therefore be of importance, I dispatch it with my own, by my servant, post-haste.Clarissa, Volume 3 (of 9)
Of course we knew at once what it meant, and he set off post-haste.The Works of Guy de Maupassant, Volume VIII.
Guy de Maupassant
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.Letters of John Calvin, Volume I (of 4)
- 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
Word Origin and History for post-haste
Online Etymology Dictionary, © 2010 Douglas Harper
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 Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.