- posthaste (adv.)
[posthaste 词源字典]
- 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 etymology, posthaste origin, 英语词源]