From the former instruction on letters ‘haste, post, haste’, later reinterpreted as a compound of post + haste.
posthaste (not comparable)
- 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.
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