The term 'stagecoach driver's 'stop!'' is a phrase used to indicate that the stagecoach driver has reached their destination and it is time to disembark. The crossword solution for this term is 'WHOA, ' which is an exclamation used to stop or slow down a horse. This term dates back to the days of the Wild West when stagecoaches were the primary mode of transportation. It is still used today in some rural areas where horse-drawn carriages are still used.