a design with strong 'horizontals' [=horizontal lines or parts]
The line extends 'horizontally'.
a 'horizontal' line/beam
(..) Then, the force of the blows pushed him backward and caused him to fall and hit his neck on something with a sharp, horizontal edge. Given this scenario, this damage to the vertebrae would have severed the victim's spinal cord, causing death. (..)2016 TvShow: Bones Title: The Murder of the Meninist Season: 11 Episode 12