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Alternative spelling of posthaste.
A great hurry.
From the former instruction on letters "haste, post, haste," later reinterpreted as a compound of post + haste.
From Wiktionary
Needless to say, I threw the gadget in the garbage, post haste.
When he had found a place which had grouse on the menu he repaired there post haste with a chum in a Ferrari.
Andrews took his watch from his pocket and, noting the time, announced that they should return post haste to the hospital.
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