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As quickly or promptly as possible. I need to get this application in the mail posthaste, or else my work permit is going to expire! Please report to your supervisor posthaste.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.


(literary) with great speed: I shall send the invitations off post-haste.This comes from the old phrase haste, post, haste, which was written on letters to tell the post (= the person taking the letters) to ride quickly to deliver them.
Farlex Partner Idioms Dictionary © Farlex 2017

post haste

As quickly as possible. According to Ebenezer Brewer, in sixteenth-century England postal messengers galloping into an inn yard would cry “Post haste!” which gave them priority in selecting the horses available for their journey. Hall’s Chronicles of ca. 1548 stated, “The Duke of Somerset, with John, erle of Oxenford, wer in all post haste flying toward Scotlande.” Shakespeare used the expression in numerous plays, and despite its archaic sound and the dubious speed of present-day postal service, it remains current on both sides of the Atlantic. It is also written as one word, posthaste.
See also: haste, post
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
Details of a review of the securities tax system, which has been left pending despite its presence in the package, and the establishment of a stock-purchasing organization must be fine-tuned posthaste to break the vicious circle of economic slowdown and plunging stock prices.
Stoico alerted McAfee, its antivirus vendor, which sent an inoculation posthaste. ISS staff also worked closely with him by phone to help his staff defuse the problem.
And the king sent for the five brothers, to bring their skills, posthaste.
"When [saltwater] fish are plunged unexpectedly into a muddy fresh-water bath, they appear to lose their heads entirely and make their way posthaste to shore," explained the July 29 Daily Register: Mobile.
"The authorities took swift action, of course, and executed Jesus posthaste. But the shocking part is this," Freeze continued, "Jesus came back to life!
Stung by the presidential outburst, Agrarian Reform Secretary John Castriciones had to form a task force posthaste to implement DAR's Administrative Order No.
Concerned authorities are working to pump the water out of the road and re-open it posthaste.
No word yet on the footwear homes of Dekline's many excellent riders (except Blake Carpenter, who jumped to the swoosh in the nick of time), but with names like Matt Bennett, Jaws Homoki and Chad Tim-Tim, expect joyful announcements posthaste. Stand tall, y'all.
For instance, the use of farm machines can enable farmers to harvest their crops posthaste during emergencies such as impending typhoons.
Minister al-Shaar said the government has taken a set of measures aimed at protecting the Palestinians in Syria, adding that the government is keen on the return of al-Yarmouk camp locals posthaste.
Finn said the building was hazardous and needed to come down "posthaste.''
Eight Eldorado County deputies screeched up posthaste, and at first glance, it seemed the reports were true: a gruesome group of gangrenous-lookin' ghouls with huge gaping wounds and protruding broken bones were indeed mauling a screamin' female.
Tom Tancredo is a candidate who would halt illegal immigration posthaste and fight for sensible spending measures and tax policies.
If you count yourself among the few, the proud, the discerning, then Auto Legends: Classics of Style and Design is something you should secure posthaste, as it is quite simply a marvelous celebration of stunning autos, from the 1901 Olds Curved Dash Runabout (arguably not the most propitious opening; the 1907 Rolls London-Edinburgh Silver Ghost should have been the first) to the 2002 Ferrari Enzo (which author Robert Cumberford, whom you may be familiar with from his work as design editor for Automobile magazine, describes as the "ultimate art-object car"--although one doesn't ordinarily think of sculptures traveling at speeds in excess of 200 mph).