1. In a vertical direction
   "a gallery quite often is added to make use of space vertically as well as horizontally"

See also: vertical

• double-faced
• double-geared
• double-glaze
• double-humped
• double-hung window
• double-jointed
• double-magnum
• double-park
• double-prop
• double-propeller plane
• double-quick
• double-reed instrument
• double-space
• double-spaced
• double-spacing
• double-team
• double-tongued
• double-u
• doubled
• doubleheader
• doubler
• doubles
• doublespeak
• doublet
• doublethink