- 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 posthaste
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.History of the United Netherlands, 1600-09, Vol. IV. Complete
John Lothrop Motley
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
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
- with great haste; as fast as possible
- archaic great haste
Word Origin and History for posthaste
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.