post haste

posthaste

[pohst-heyst]
adverb
1.
with the greatest possible speed or promptness: to come to a friend's aid posthaste.
noun
2.
Archaic. great haste.

Origin:
1530–40; post3 + haste

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
posthaste (ˈpəʊstˈheɪst)
 
adv
1.  with great haste; as fast as possible
 
n
2.  archaic great haste

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

posthaste
1545, usually said to be from "post haste" instruction formerly written on letters (attested from 1538), from post (3) "system for sending mail" + haste. The verb post "to ride or travel with great speed" is recorded from 1558.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
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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