upper -- (piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot; "Uppers come in many styles")
amphetamine, pep pill, upper, speed -- (a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression)
Overview of adj upper
The adj upper has 3 senses
upper -- (the topmost one of two)
upper -- (higher in place or position; "the upper bunk"; "in the upper center of the picture"; "the upper stories")
upper -- (superior in rank or accomplishment; "the upper half of the class")