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