AskDefine | Define posthaste

Dictionary Definition

post-haste adv : as fast as possible; with all possible haste; "send it to me post-haste"

User Contributed Dictionary



From the former instruction on letters ‘haste, post, haste’, later reinterpreted as a compound of post + haste.


  • a RP /ˌpəʊstˈheɪst/
  • a US /ˌpoʊstˈheɪst/


  1. quickly, as fast as someone travelling post; with great speed
    It is imperative that you finish your task posthaste.



  • 1946 — Paramahansa Yogananda, Autobiography of a Yogi, Ch. 17
    "Sasi cannot last through the night." These words from his physician, and the spectacle of my friend, now reduced almost to a skeleton, sent me posthaste to Serampore.

Alternative forms

Synonyms, Antonyms and Related Words

amain, apace, at flank speed, breakneck, by airmail, by cable, by express, by return mail, by telegraph, double-quick, expeditious, expeditiously, express, fast, flat-out, fleet, full tilt, hand over fist, hand over hand, hastily, hasty, hell for leather, hell-bent, hell-bent for election, in double time, in double-quick time, in high, in high gear, in posthaste, in seven-league boots, lickety-cut, lickety-split, on the double, post, promptly, quick, quickly, rapid, rapidly, snappily, speedily, speedy, swift, swiftly, trippingly, under forced draft, whip and spur, with all haste, with giant strides, with rapid strides, with speed
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