• (RP) IPA: /ˌpəʊstˈheɪst/
  • (America) IPA: /ˌpoʊstˈheɪst/

posthaste (not comparable)

  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.
Synonyms Noun

posthaste (uncountable)

  1. Alternative spelling of post-haste
    • 1602 : Hamlet by William Shakespeare, act 1 scene 1 l 103-106
      "And this, I take it,
      Is the main motive of our preparations
      The source of this our watch, and the chief head
      Of this post-haste and rummage in the land."

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