being further up, literally or figuratively; higher in place, position, rank, dignity, or the like; superior; as, the upper lip; the upper side of a thing; the upper house of a legislature. The upper hand, the superiority; the advantage. See To have the upper hand, under Hand. Upper bench, all those parts of the hull of a vessel that are properly above water. Upper world. The atmosphere. Heaven. This world; the earth; in distinction from the underworld. A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression.