sill
Definition
A flat horizontal piece at the bottom of a door or window; also, in geology, a sheet of igneous rock that has intruded between older rock layers.
Example
"He wiped his boots on the doorstep before stepping over the sill."
A flat horizontal piece at the bottom of a door or window; also, in geology, a sheet of igneous rock that has intruded between older rock layers.
"He wiped his boots on the doorstep before stepping over the sill."