Use the adjective upper to describe something that's the highest or top in position or rank. Your upper arm is above your lower arm, and the upper bunk on your bunkbed is closest to the ceiling.

Upper is useful for talking about anything that's located above something else. You might ski on a mountain's upper slope, taking the ski lift up as high as it goes, or become an astronaut so you can travel through the Earth's upper (or most remote) atmosphere. As a noun, an upper is the part of a shoe that's above the sole. And if you have the upper hand, it means you've got an advantage over someone else.

Definitions of upper
  1. adjective
    higher in place or position
    “the upper bunk”
    “in the upper center of the picture”
    “the upper stories”
    (literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high')
  2. adjective
    the topmost one of two
    situated at the top or highest position
  3. adjective
    superior in rank or accomplishment
    “the upper half of the class”
    of or characteristic of high rank or importance
  4. noun
    the higher of two berths
    synonyms: upper berth
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    type of:
    berth, built in bed, bunk
    a bed on a ship or train; usually in tiers
  5. noun
    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”
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    toe box
    the forward tip of the upper of a shoe or boot that provides space and protection for the toes
    type of:
    piece of leather
    a separate part consisting of leather
  6. noun
    a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
    see moresee less
    amphetamine sulfate, amphetamine sulphate
    a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system
    Benzedrine, bennie
    a form of amphetamine
    Dexedrine, dextroamphetamine sulphate
    an isomer of amphetamine (trade name Dexedrine) used as a central nervous system stimulant
    type of:
    drug of abuse, street drug
    a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction
    excitant, stimulant, stimulant drug
    a drug that temporarily quickens some vital process
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