English

Definition of post-haste adverb from the Oxford Advanced Learner's Dictionary

 

post-haste

 adverb
adverb
BrE BrE//ˌpəʊst ˈheɪst//
 
; NAmE NAmE//ˌpoʊst ˈheɪst//
 
(literary)
 
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as quickly as you can to depart post-haste Word Originmid 16th cent.: from the direction “haste, post, haste”, formerly given on letters.