1. the threshold or sill at the bottom of a doorway; the horizontal piece that forms the base of a door frame.

Examples

• She stepped over the doorsill as she entered the house.
• The old wooden doorsill was worn smooth by decades of footsteps.
• He tripped on the doorsill while carrying the boxes inside.
• The doorsill needed to be replaced after water damage.
• The cat sat on the doorsill, watching the birds outside.