From the former instruction on letters "haste, post, haste," later reinterpreted as a compound of post + haste.
post-haste (not comparable)
- Alternative spelling of posthaste
- A great hurry.
- 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."