That has rolled down, or been rolled down; specifically (of a window) that has been moved down to an open position by rotating a handle or activating an electronic control.
Origin
Late 19th century.
Definition of rolled-down in US English:
rolled-down
adjective
That has rolled down, or been rolled down; specifically (of a window) that has been moved down to an open position by rotating a handle or activating an electronic control.