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[pohst-heyst] /ˈpoʊstˈheɪst/

with the greatest possible speed or promptness:
to come to a friend’s aid posthaste.
Archaic. great .
with great haste; as fast as possible
(archaic) great haste

1590s, from a noun (1530s) meaning “great speed,” usually said to be from “post haste” instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The verb post “to ride or travel with great speed” is recorded from 1550s.
posthaste [(pohst-hayst)]

Immediately, with great speed: “Get the flood warning to the media posthaste.”


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