Is it ensure, insure, or assure?
four-wheeled, closed carriage, containing one seat for two or three passengers, that was popular in 18th-century England. The body was of the coupe type, appearing as if the front had been cut away. Because the driver rode one of the horses, it was possible to have windows in front as well as at the sides. At the post chaise's front end, in place of the coach box, was a luggage platform. The carriage was built for long-distance travel, and so horses were changed at intervals at posts (stations)