post-haste
/ˌpəʊstˈheɪst/
adverb
with great speed or immediacy.
"she would go post-haste to England"
Similar:
as quickly as possible
as soon as possible
ASAP
without delay
(very) quickly
speedily
swiftly
without further/more ado
with all speed
promptly
immediately
at once
straight away
right away
directly
forthwith
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