posthaste

[ pohst-heyst ]
/ ˈpoʊstˈheɪst /

adverb

with the greatest possible speed or promptness: to come to a friend's aid posthaste.

noun

Archaic. great haste.

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Origin of posthaste

First recorded in 1530–40; post3 + haste
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for post-haste

British Dictionary definitions for post-haste

posthaste
/ (ˈpəʊstˈheɪst) /

adverb

with great haste; as fast as possible

noun

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

Cultural definitions for post-haste

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 Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.