1 If a lot of blood leaks out, it can cause a buildup of pressure in the brain because the brain is enclosed in the skull. There is no room for brain tissue to expand, and so the leaked blood can compress and kill important areas of the brain.  Hemorrhagic strokes tend to be more serious than ischemic strokes.
Horizontal definition, at right angles to the vertical; parallel to level ground. See more.
1 adj Something that is vertical stands or points straight up., (Antonym: horizontal) The gadget can be attached to any vertical or near vertical surface. Cut each bulb in half vertically. 2 n-sing The vertical is the direction that points straight up, at an angle of 90 degrees to a flat surface. the N. Pluto seems to have suffered a major collision that tipped it 122 degrees from the vertical.