Synonyms of post-haste in English:
he departed post-haste for Venice
as quickly as possible, without delay, (very) quickly, speedily, swiftly, without further/more ado, with all speed, promptly, immediately, at once, straight away, right away, directly, forthwith
informaldouble quick, p.d.q. (pretty damn quick), pronto, before you can say Jack Robinson, straight off
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