post-haste
nounUK /ˌpəʊstˈheɪst/ · US /ˌpoʊstˈheɪst/
Etymology From the former instruction on letters "haste, post, haste," later reinterpreted as a compound of post + haste.
1
A great hurry.
- 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.c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene i], lines 103-106: