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
informal double quick, p.d.q. (pretty damn quick), pronto, before you can say Jack Robinson, straight off
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