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post-haste (adv.)

"with urgent speed, with all possible haste," 1590s, from a noun (1530s) meaning "great speed," usually said to be from "post haste," an instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The phrase originated in the old system of relaying messages by post horses (see post (n.3)); the verb post "to ride or travel with great speed" is recorded from 1550s.

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Definitions of post-haste from WordNet

post-haste (adv.)
as fast as possible; with all possible haste;
send it to me post-haste
From wordnet.princeton.edu